©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at Ann Naturhist Mus Wien 101 B 3 - 161 Wien Dezember 1999 The Philippine Water Bug Inventory Project aims and results by Museum of Natural History, University of the Philippines Los Banos Department of Entomology, University of the Philippines Los Banos Department of Entomology, Natural History Museum Vienna Valleriola mindorana DRAKE, 1956 (Leptopodidae) ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at 34 Annalen des Naturhistorischen Museums in Wien 101 B Contents V.P & ZETTEL, H.: The Philippine Water Bug Inventory Project (PWBIP) and a bibliography for Philippine Nepomorpha, Gerromorpha, and Leptopodomorpha (Insecta: Heteroptera) 35 A.C.: The Museum of Natural History, University of the Philippines Los Banos, and the Philippine Water Bug Inventory Project 41 H., NIESER, N & POLHEMUS, D.A.: The Naucoridae (Insecta: Heteroptera) of the Philippine Islands 43 H.: TWO new Philippine Aphelocheirus WESTWOOD, 1833 (Heteroptera: Aphelocheiridae) and a key to the Philippine species 107 N & ZETTEL, H.: The Enithares SPINOLA, 1837 (Insecta: Heteroptera: Notonectidae) of the Philippines, with descriptions of two new taxa 123 GAPUD, SUMALDE, ZETTEL, ZETTEL, NIESER, H & GAPUD, V.P: A new species group of Oriental Microvelia s.l (Insecta: Heteroptera: Veliidae), with descriptions of three new species 135 ZETTEL, C: TWO new species of Pseudovelia HOBERLANDT, 1950 (Insecta: Heteroptera: Veliidae) from Palawan and Busuanga, Philippines 147 H.: Notes on Philippine Potamometwpsis LUNDBLAD, 1933 (Insecta: Heteroptera: Gerridae) 155 SEHNAL, ZETTEL, ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at Ann Naturhist Mus Wien 101 B 35-40 Wien, Dezember 1999 The Philippine Water Bug Inventory Project (PWBIP) and a bibliography for Philippine Nepomorpha, Gerromorpha, and Leptopodomorpha (Insecta: Heteroptera) V.P Gapud* & H Zettel** "Taxonomy is a fascinating branch of biology, unique in that it must always be retrospective as well as prospecitve." Barry Bolton, 1995 Abstract The "Philippine Water Bug Inventory Project" is a research cooperation between scientists of the Museum of Natural History and the Department of Entomology of the University of the Philippines Los Banos, and the Natural History Museum Vienna, Austria The aim is an inventory of Philippine Nepomorpha, Gerromorpha, and Leptopodomorpha, which includes taxonomic research, zoogeographical analysis of distribution patterns, establishment of a collection of water bugs in the Philippines, and recommendations for nature protection A bibliography on Philippine water bugs is added Key words: Philippine Water Bug Inventory Project, Heteroptera, Nepomorpha, Gerromorpha, Leptopodomorpha, research, taxonomy, biogeography, collection, bibliography, Philippines Zusammenfassung Das "Philippine Water Bug Inventory Project" ist eine wissenschaftliche Zusammenarbeit zwischen dem Museum of Natural History und dem Department of Entomology der University of the Philippines Los Banos sowie dem Naturhistorischen Museum Wien Forschungsziel ist ein Inventar philippinischer Wasserwanzen (Nepomorpha, Gerromorpha, and Leptopodomorpha), das taxonomische Bearbeitungen, eine zoogeographische Analyse von Verbreitungsmustern, den Aufbau einer Vergleichssammlung auf den Philippinen sowie Empfehlungen für den Naturschutz einschließt Eine Bibliographie über philippinische Wasserwanzen ist angefügt Introduction The Philippines remains a rich country: biologists have only hazy notions about how many animal and plant species live here However, they agree on one point: only a few countries in the world have a similarly high rate of endemism as the Philippines has Isolated from mainland Asia within the Pacific Ocean, coupled with its island nature (composed of about 7000 islands), the Philippines is unique for its flora and fauna Prof Dr Victor P Gapud, Department of Entomology, University of the Philippines, Los Banos, College, Laguna 4031, The Philippines Dr Herbert Zettel, Naturhistorisches Museum in Wien, Zoologische Abteilung, Burgring 7, A-1014 Vienna, Austria ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at 36 Annalen des Naturhistorischen Museums in Wien 101 B Entomologists are only beginning to study Philippine insects Described insects are still very few, probably less than 10 % of the actual number Moved by a strong sense of urgency, entomologists have to race against time to discover and describe them, in the midst of the rapid destruction of the natural habitats, which has probably already resulted in the extinction of many species Although we suspect that a high percentage of Philippine insects is already extinct, we continue to hope that we can retrieve most of the remaining species before they become extinct, considering that only less than % of the virgin forests remain untouched We must first discover these unique insects, so we can find ways to protect them In this regard, an inventory is essential How we expect to accomplish this gigantic and enormous task for hundreds of thousands of species? We can only make spot checks within the diversity of insects One of them is the "Philippine Water Bug Inventory Project", which is a cooperation between scientists of the Museum of Natural History and the Department of Entomology of the University of the Philippines Los Banos, and of the Natural History Museum Vienna, Austria, with participation of specialists from the U.S.A., China, England, and the Netherlands Why water bugs? The water bugs consist of three systematic groups of True Bugs (Hemiptera - Heteroptera): the Nepomorpha (True Water Bugs) living mostly in the water; the Gerromorpha (Water Striders) living mostly on the water surface; and the Leptopodomorpha (Shore Bugs) inhabiting mostly banks and shores Most species are associated with freshwater, and a minority with the sea (Sea Skaters, Coral Bugs, etc.) While more than 100 described species of water bugs are presently known from the Philippines, we estimated the actual number of species to be higher than 400 Water bugs are an ideal insect group as indicators of the status of aquatic habitats, because they usually occur in good numbers (collection poses no danger to their existence), are easy to sample (rapid accumulation of data), are not too high in species numbers, and often have very distinct habitat preferences Furthermore, many groups have low migration (dispersal) abilities and therefore exhibit high endemism rates and interesting distribution patterns, which can be compared with the distribution of other Philippine animals The majority of species is endemic to the Philippines (more than 80 %; this percentage will increase as a result of continuing description of new species) Likewise, a high number of species is endemic to single islands This is especially true for the running water species, while marine, brackish water, and stagnant water species usually have wide distributions Goals of PWBIP The PWBIP is a basic research project and an exemplary study for biodiversity of Philippine freshwater habitats It is carried out to give an impression of the diversity of a special insect group in the Philippines Details of distribution patterns found will be valuable also for the study of other organisms Furthermore, the study will provide inportant information on highly endangered freshwater habitats for the purpose of protection and conservation management Moreover, this effort hopes to foster close collaboration between local and foreign entomologists in efforts to accelerate our understanding of and appreciation for Philippine insects in general and water bugs in particular ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at GAPUD & ZETTEL: The Philippine Water Bug Inventory Project (Heteroptera) 37 And finally, the project establishes a collection of the studied species in the Museum of Natural History, University of the Philippines Los Bafios, to provide Philippine scientists with reference material, especially type material, for future studies Philippine water bug research Intensive studies on the Philippine water bugs were initially carried out by scientists from the U.S.A (H.B Hungerford, R Matsuda, C.J Drake, T.W Porter, I La Rivers), who worked mainly on the material collected by the expedition of the Field Museum, Chicago, in 1946 - 1947 (for itinerary see HOOGSTRAAL 1951); and by N.M Andersen (from Copenhagen, Danmark) and I Lansbury (Oxford, England), who studied the material of the Danish Noona Dan Expedition in 1961 The first over-all study, with descriptions of new species, was published by POLHEMUS & REISEN (1976) Until today, Philippine species were included in several taxonomic revisions by D.A and J.T Polhemus (U.S.A.), by P.P Chen (China), and by N Nieser (The Netherlands) (see Bibliography) Research activities and results of PWBIP In the seventies and eighties the first author started with more detailed studies, which mainly concentrated on the Mesoveliidae, Ochteridae, and all families of Leptopodomorpha In 1977 he published a revision of Philippine Ochteridae (GAPUD & SAN VALENTIN 1977); and in 1986 a major contribution to the Philippine water bugs, with a key to all families, to the genera of Saldidae, and to the species of Saldidae, Leptopodidae, and Ochteridae (GAPUD 1986a) Follow-up studies are dedicated to the descriptions of new species (GAPUD 1981, 1986b, 1991) In the eighties he established a close cooperation with J.T and D.A Polhemus, who made intensive collections in 1985 In 1992 the second author spent his holidays in the Philippines His initial interest in aquatic Heteroptera focused on the Philippine fauna In 1993 he established cooperation with the Museum of Natural History, University of the Philippines Los Banos This cooperation was intensivated in 1995 through the enthusiastic leadership of A.C Sumalde, the Director of the Museum of Natural History The continuous and vigorous support of Dr Sumalde has facilitated the pace and the success of all efforts of PWIBP His activities and his understanding demonstrate impressively the general importance of supporting the research done in natural history museums at a high international level Initial research activities of the second author mainly concentrated on the family Veliidae, which contains more than one third of all Philippine water bug species Studies on the genus Rhagovelia MAYR, 1865 (ZETTEL 1994b, d, 1995a, 1996) showed that even small islands have endemic stream-inhabiting veliid species Therefore his field work included islands, which had not been examined before A similar study on the veliid genus Pseudovelia HOBERLANDT, 1950, presently carried out by C Sehnal (Vienna), provides comparable results Zoogeographical analyses confirm early statements on the Philippine fauna by DICKERSON & al (1928), but also provide new results on the distribution of species and species complexes Smaller studies of the second author deal with the families Gerridae (ZETTEL 1994a, c), Notonectidae (ZETTEL 1995b), Aphelocheiridae (ZETTEL 1998C), and Veliidae (LANSBURY & ZETTEL 1997, ZETTEL 1998a, b) ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at 38 Annalen des Naturhistorischen Museums in Wien 101 B Presently, published results of PWBIP are mostly taxonomically orientated (see Bibliography) However, information on the preferred habitats of species are often included (especially by GAPUD 1986a) The rapidly increasing material of PWBIP and the high number of undescribed species, require the participation of other scientists, who will help by contributing their knowledge of difficult groups This is also expressed by the articles published in this volume Bibliography (literature cited, publications on [or important publications including] Philippine Water Bugs, and all papers from PWBIP activities) N.M 1965: A remarkable new species of Rhagovelia MAYR from the Philippines (Heteroptera, Veliidae) - Entomologiske Meddelelser 34: 111-117 ANDERSEN, N.M 1967: A Contribution to the Knowledge of Philippine Semiaquatic HemipteraHeteroptera - Entomologiske Meddelelser 35: 260-282 ANDERSEN, E 1918: Studies on Philippine Heteroptera, - Philippine Journal of Science, Sect D, 13: 75-126 BERGROTH, G.T 1951: A revision of the genus Anisops (Notonectidae, Hemiptera) - University of Kansas Science Bulletin 34(1): 301-519 BROOKS, CHEN, P.P & NIESER, N 1993: A taxonomic revision of the Oriental water strider genus Metrocoris MAYR (Hemiptera, Gerridae) Part I & II - Steenstrupia 19(1): 1-43, 45-82 R.E., in collaboration with MERRILL E.D., MCGREGOR R.C., SCHULTZE W., TAYLOR E.H & HERRE A.W.C.T 1928: Distribution of Life in the Philippines - Manila, Bureau of Printing, 322 pp., 42 pits DICKERSON C.J 1956: Philippine Leptopodidae (Hemiptera) - Philippine Journal of Science 85: 467-469 DRAKE, C.J & VIADO, G.B 1952 (1951): Saldoidea of the Philippines (Hemiptera) - Philippine Journal of Science 80: 339-342 DRAKE, V.P 1981: Contribution to the taxonomy of the genus Ochterus LATREILLE (Hemiptera: Ochteridae) - Kalikasan, Philippine Journal of Biology 10(2-3): 300-309 GAPUD, GAPUD, V.P 1986a: Philippine Water Bugs - Guide to Philippine Flora and Fauna 8: 1-47 V.P 1986b: Contribution to the taxonomy of Philippine Leptopodidae (Hemiptera) The Philippine Entomologist Journal 6(6): 595-611 GAPUD, V.P 1995: A new species of Ochterus LATREILLE (Hemiptera: Ochteridae) from the Philippines - Asia Life Sciences 4(1): 41-44 GAPUD, V.P & SAN VALENTIN, H.O 1977: The Ochteridae (Hemiptera) of the Philippines Kalikasan, Philippine Journal of Biology 6(3): 269-300 GAPUD, H 1951: Philippine Zoological Expedition 1946-1947 Narrative and Itinerary Fieldiana, Zoology 33(1): 1-86, plates HOOGSTRAAL, HUNGERFORD, H.B & MATSUDA, R 1958a: The genus Esakia with two new species (Heteroptera, Gerridae) - Journal of the Kansas entomological Society 31 (3): 193-197 H.B & MATSUDA, R 1958b: A new Ptilomera from the Philippines (Hemiptera: Gerridae) - Bulletin of the Brooklyn Entomological Society 33: 69-73 HUNGERFORD, ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at GAPUD & ZETTEL: The Philippine Water Bug Inventory Project (Heteroptera) 39 H.B & MATSUDA, R I960: Concerning the genus Ventidius and five new species (Heteroptera: Herrodae) - Kansas University Science Bulletin 40: 323-343 HUNGERFORD, H.B & MATSUDA, R 1961: Some new species of Rhagovelia from the Philippines (Veliidae, Heteroptera) - University of Kansas Science Bulletin 42 (4): 257-279 LANSBURY, I 1967: Aquatic Hemiptera-Heteroptera of the Noona Dan Expedition to the Philippines and Bismark Islands - Entomologiske Meddelelser 35: 89-98 HUNGERFORD, I 1968: The Enithares (Hemiptera-Heteroptera: Notonectidae) of the Oriental Region - Pacific Insects 10: 353-442 LANSBURY, , I 1972: A review of the Oriental species of Ranatra FABRICIUS (Hemiptera Heteroptera): Nepidae) - Transactions of the Royal Entomological Society of London 124: 287-341 LANSBURY I & ZETTEL, H 1997: New species and subspecies of the genus Strongylovelia ESAKI (Insecta: Heteroptera: Veliidae) from Borneo and the Philippines - Annalen des Naturhistorischen Museums in Wien 99B: 51-77 LANSBURY, I 1969: Entomological miscellanei I A new genus and species of naucorid from the Philippines (Hemiptera) - Occasional Papers of the Biological Society Nevada 18: 1-4 LA RIVERS, I 1970a: A new Philippine Sagocoris (Hemiptera: Naucoroidea) - Pan-Pacific Entomologist 46: 167-169 RIVERS, I 1970b: A new species of Laccocoris from the Philippines (Hemiptera: Naucoridae) - The Wasmann Journal of Biology 28: 269-273 LA RIVERS, LA NIESER N 1995: Nine new species of Pseudovelia and a new Xiphovelia (Heteroptera: Veliidae) from Sulawesi (Indonesia) and Mindanao (Philippines) Notes on Malesian aquatic and semiaquatic bugs (Heteroptera), V - Tijdschrift voor Entomologie 138: 69-87 N & CHEN, P.P 1996: Six new taxa of Nepomorpha from Sulawesi and Mindanao Tijdschrift voor Entomologie 139: 161-174 NIESER, D.A 1990: A revision of the genus Metrocoris MAYR (Heteroptera: Gerridae) in the Malay Archipelago and the Philippines - Entomologica Scandinavica 21: 1-28 POLHEMUS, D.A 1995: Two new species of Rhagovelia from the Philippines, with a discussion of Zoogeographie relationships between the Philippines and New Guinea (Heteroptera: Veliidae) - Journal of the New York Entomological Society 103(1): 55-68 POLHEMUS D.A 1998: Two new species of water striders (Heteroptera: Gerridae) from the Philippines - Proceedings of the Entomological Society of Washington 100: 261-268 POLHEMUS, D.A & J.T POLHEMUS 1987: A new genus of Naucoridae (Hemiptera) from the Philippines, with comments on zoogeography - Pan-Pacific Entomologist 63(3): 265-269 POLHEMUS, D.A & J.T POLHEMUS 1988: The Aphelocheirinae of tropical Asia (Heteroptera: Naucoridae) - The Raffles Bulletin of Zoology, Singapore 36(2): 167-300 POLHEMUS, J.T & REISEN W.K 1976: Aquatic Hemiptera of the Philippines - Kalikasan Philippine Journal of Biology 5(3): 259-294 POLHEMUS T.W 1954: A new species of Hebrus CURTIS from the Philippine Islands (Hemiptera, Hebridae) - Journal of the Kansas Entomological Society 27: 78-79 PORTER, T.W 1959: Three new species of Hebrus CURTIS from the Philippine Islands (Hemiptera, Hebridae) - Journal of the Kansas Entomological Society 32: 31-35 PORTER, R.L 1938: The Naucoridae of the Philippine Islands (Hemiptera) - The Philippine Journal of Science 64: 299-311 USINGER, ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at 40 Annaten des Naturhistorischen Museums in Wien 101 B R.L 1942: A new Philippine leptopodid with remarks on the classification of the family (Hemiptera) - Bulletin of the Brooklyn Entomological Society 37: 103-106 USDMGER, YANO, K., MIYAMOTO, S., & GABRIEL, B.P 1981: Faunal and biological studies on the insects of paddy fields in Asia IV aquatic and semiaquatic Heteroptera from the Philippines Esakia 16: 5-32 H 1994a: Ein neuer Rheumatogonus KIRKALDY von den Philippinen (Heteroptera: Gerridae) - Entomological Problems 25(1): 79-82 ZETTEL, H 1994b: Zwei neue Rhagovelia-Arten aus Mindoro, Philippinen (Heteroptera: Veliidae) - Entomofauna 15(19): 225-236 ZETTEL, H 1994C: Revision der Gattung Potamometropsis LUNDBLAD (Insecta: Heteroptera: Gerridae) - Annalen des Naturhistorischen Museums in Wien 96 B: 75-98 ZETTEL, H 1994d: Revision der philippinischen Arten der Gattung Rhagovelia (Heteroptera: Veliidae) - Entomological Problems 25(2): 33-48 MAYR, Teil H 1995a: Revision der philippinischen Arten der Gattung Rhagovelia (Heteroptera: Veliidae) Teil - Entomological Problems 26(1): 43-78 MAYR ZETTEL, ZETTEL, H 1995b: Neubeschreibungen von zwei Arten der Gattung Aphelonecta LANSBURY aus Indonesien und den Philippinen sowie ein Bestimmungsschlüssel zu den Arten (Heteroptera: Notonectidae) - Linzer biologische Beiträge 27(1): 107-113 ZETTEL, H 1996: Revision der philippinischen Arten der Gattung Rhagovelia, Teil (Heteroptera: Veliidae) - Entomological Problems 27(2): 111-140 ZETTEL, H 1998a: Diversity and distribution of Philippine Veliidae (Heteroptera) In: Book of Abstracts Vlth European Congress of Entomology (BRUNNHOFER V & SOLDAN T eds.), Ceské Budejovice, August 23-29, 1998, pp 406-407 ZETTEL, H 1998b: Notes on marine Haloveliinae (Heteroptera: Veliidae) from the Philippine Islands, with descriptions of three new species - Entomofauna 19(27): 461-472 ZETTEL, H 1998C: Neue Taxa der Gattung Aphelocheirus WESTWOOD, 1833 (Insecta: Heteroptera: Aphelocheiridae) aus der Orientalischen Region sowie Bemerkungen zu einigen beschriebenen Arten und zu den Raubbeinen der Naucoroidea - Annalen des Naturhistorischen Museums in Wien 100B: 11-91 ZETTEL, ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at Ann Naturhist Mus Wien 101 B 41 -42 Wien, Dezember 1999 The Museum of Natural History, University of the Philippines Los Banos, and the Philippine Water Bug Inventory Project A.C Sumalde* Abstract The Museum of Natural History of the University of the Philippines Los Banos is an important repository for biological specimens, especially arthropods, in the Philippines It supports biodiversity research in the Philippines by international cooperations like the Philippine Water Bug Inventory Project The establishment of Philippine collections provides Philippine scientists with reference specimens for future studies Key words: Philippine Water Bug Inventory Project, museum, Los Banos, Philippines, biodiversity, arthropod repository, documentation, research The Museum of Natural History (MNH) belongs to the University of the Philippines Los Banos (UPLB), which is situated at the foothills of the Mount Makiling, a "classical" research place about 65 road kilometres South of Manila The museum is a center of documentation as well as a repository of biological specimens It is a Philippine center of biological research, information, and education Its role parallels that of a library for written records The MNH was established in 1976 It was organized out of the staff and physical resources of the existing collections of the different colleges of UPLB In 1993 the MNH managed to acquire its own building for its integrated exhibits and offices The MNH has more than 200 000 biological specimens; more than half of them compose the Entomological Collection, which includes insects, mites, and other arthropods A good number of sample specimens is on long-term exhibit at the MNH building at the College of Forestry campus Because of space limitation, the rest of the collections are still housed in other units of UPLB The self-image of the MNH is that of a national research institution of international importance Therefore, for several years, the MNH has encouraged foreign scientists to cooperate: to work on its present collections (identifications) and to enrich them by additional samplings and donations of reference specimens The establishment of good reference collections seems to be most important for present and future activities of Philippine and guest scientists At least for entomological collections, the MNH is presently the scientific center in the Philippines The Philippine-Austrian cooperation on aquatic and semiaquatic Heteroptera (Philippine Water Bug Inventory Project) began already in 1993 Research contracts are concluded annually The cooperation includes Philippine and Austrian scientists, but expertise of an international group of entomologists is necessary Several field trips have been carried Prof Dr Augusto C Sumalde, Director of the Museum of Natural History, University of the Philippines, Los Banos, Laguna, 4031 Philippines ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at 42 Armalen des Naturhistorischen Museums in Wien 101 B out Half of the new samplings, including the holotypes, are deposited in MNH It is important that, for the first time, a nearly complete set of Philippine species of a certain insect group is deposited in our country and enables easy access for future Philippine research Because of the lack of national funds, a more intensive integration of Philippine scientists in international projects like the Philippine Water Bug Inventory Project is desirable ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at Ann Naturhist Mus Wien 101 B 147 - 154 Wien, Dezember 1999 Two new species of Pseudovelia HOBERLANDT, 1950 (Insecta: Heteroptera: Veliidae) from Palawan and Busuanga, Philippines C Sehnal* Abstract Two species of Pseudovelia HOBERLANDT, 1950, from the Philippines are described as new: Pseudovelia tenuis sp.n from Busuanga and P lata sp.n from Palawan They are closely related to P borneensis ANDERSEN, 1983, from Sarawak and Sabah (Borneo) Key words: Pseudovelia, Veliidae, Palawan, Busuanga, Philippines, new species Zusammenfassung Zwei neue Arten der Gattung Pseudovelia HOBERLANDT, 1950, werden von den Philippinen beschrieben: Pseudovelia tenuis sp.n von Busuanga und P lata sp.n von Palawan Sie sind nahe verwandt mit P borneensis ANDERSEN, 1983, von Sarawak und Sabah (Borneo) Introduction Until now three described species of Pseudovelia HOBERLANDT, 1950, are known to occur on the Philippine Islands: Pseudovelia reiseni POLHEMUS, 1976, endemic on Luzon, P argyropardala NIESER, 1995, described from Karakelong (north of Sulawesi) and Mindanao, and P kalami NIESER, 1995, endemic on Mindanao (Fig 1) NIESER (1995) reports P reiseni also from Mindanao, but after examination of the same material it turns out that it belongs to an undescribed species A fourth species, P feuerborni LUNDBLAD, 1933, described from a single macropterous male from Java, was reported by ANDERSEN (1983) from Singapore, Malaysia, Thailand, and Luzon The record from the Philippines was based on a single macropterous female from Mt Makiling (province Laguna) Because of the difficulties in the distinction of females, the regional distribution of nearly all species of Pseudovelia, and the frequent occurence of an undescribed species from the same locality, the record of P feuerborni is very improbable (Fig 1) This paper deals with the species of the Palawan Region (Palawan and Busuanga) Two species are described as new: Pseudovelia tenuis sp.n from Busuanga and P lata sp.n from Palawan They are endemic on these islands and closely related to P borneensis ANDERSEN, 1983, described from Sarawak and Sabah (Borneo) After a perfunctory study of further material collected by V.P Gapud, N Nieser, J.T Polhemus, and H Zettel in the last twenty years, at least 21 undescribed species of Pseudovelia are estimated to occur on Luzon, Mindoro, the Visayas, and Mindanao * Mag Christine Sehnal, Naturhistorisches Museum in Wien, Zoologische Abteilung, Burgring 7, A-1014 Vienna, Austria ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at Annalen des Naturhistorischen Museums in Wien 101 B 148 • Pseudovelia reiseni HD P kalami P argyropardala D P feuerborni ? • P tenuis sp.n A P lata sp.n • undescribed species o material not yet studied "N Borneo &-\ iI an / / ,, ' Fig I : Distribution of the described and undescribed species of Pseudovelia on the Philippines ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at SEHNAL: TWO new species of Pseudovelia (Heteroptera: Veliidae) from the Philippines 149 Abbreviations CZV JTPC = Collection H Zettel, Vienna, Austria = John T Polhemus Collection, Englewood, Colorado, USA NHMV = Natural History Museum, Vienna, Austria UPLB = Museum of Natural History, University of the Philippines, L o s Bafios ' Philippines a l P= apterous macr = macropterous Acknowledgements I am especially grateful to Dr Herbert Zettel (Vienna) for the loan of material and his critical advice, to Dr John T Polhemus (Englewood, Colorado) for the loan of material, to Dr Nico Nieser (Tiel, The Netherlands), and Dr Dan A Polhemus (Washington) for reviewing the manuscript Pseudovelia tenuis sp.n Holotype: (apt.) [PHILIPPINEN: Palawan Pr.XBusuanga Is., km NW CoronX Mabintangen Riv., 25.29.2.X 1996, leg H Zettel (82)] (UPLB) Paratypes: (apt.) same data as holotype (CZV); d, (apt.) [PHILIPPINEN: Palawan Pr.XBusuanga Is., km WXCoron, 23.2.1996X leg H Zettel (80b)] (CZV); 6, 99 (apt.) [PHILIPPINEN: Palawan Pr.XBusuanga Is., 13 rd km WNWXCoron, Balulu Falls, 24.2.X 1996, leg H Zettel (81)] (CZV, NHMV, UPLB); (apt.) [Philippinen: Palawan Pr.XBusuanga Isl., km NW CoronX Mabentangen For Res 1.-7.2.X 1999, leg H Zettel (170)] (CZV); (apt.) [Philippinen: Palawan Pr.XBusuanga Isl.X 13 rd k m \ WNW Coron, Balulu FallsX2.2.1999, leg Zettel (171)] (NHMV) Apterous male Size Length 2.07 - 2.15 mm, maximum width (across suture between metanotum and laterotergite 1) 0.77 - 0.80 mm, width of pronotum 0.70 - 0.73 mm, width of head 0.52 - 0.55 mm Colour Head dark brown to blackish; antennae brown, sometimes with base of segment light brown Pronotum dark brown, with horizontal stripe near anterior margin yellowish to light brown; black, irregularly distributed pores on pronotum except on stripe Metanotum blackish to dark reddish-brown Legs dark brown, with basal part of femora yellow Tergites, laterotergite 1, and inner parts of laterotergites - dark brown to blackish, outer parts slightly lighter Ventral surface of thorax and abdomen black, stripe on lateral margins of sternites and posterior margin of sternite light brown Pilosity Entire body surface covered with short, decumbent to suberect, silvery hairs Long, erect hairs scattered on vertex along margin of eyes, antennae, and legs, hirsute on pronotum, metanotum, tergites, laterotergites, and sternites Stout, silvery hairs forming stripes on vertex along margin of eyes, and patches laterally on tergite 1, posteromedially on tergite 6, and antero-medially on tergite 7, sometimes also at base of vertex, on horizontal stripe of pronotum, postero-medially on tergites and 3, on posterior margin of laterotergite 1, and on posterior inner parts of laterotergites and Metatarsal segment with row of short, erect hairs over entire length, about five hairs at base of segment stout and bristle-like (Fig 10) Eyes naked except for two ocular setae Structural characters Ventral lobe of head not produced backward Antennae 0.64 - 0.69 times as long as body, relative lengths of segments - as 1.5 - 1.6 : : 1.1 - 1.3 : 1.8 - 1.9 (Fig 9) Pronotum 0.57 - 0.61 times as long as wide Ratio of femur : tibia : tarsus ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at 150 Annalen des Naturhistorischen Museums in Wien 101 B Figs - 11: (2 - 5) segment of male in (2, 3) ventral view and (4, 5) lateral view of (2, 4) P tenuis sp.n and (3, 5) P lata sp.n (6 - 7) abdominal segments of female in lateral view of (6) P tenuis sp.n and (7) P lata sp.n (8 - 9) antenna of (8) P lata sp.n and (9) P tenuis sp.n (10 - 11) metatarsus of male of (10) P tenuis sp.n and (11)/' lata sp.n ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at SEHNAL: TWO new species of Pseudovelia (Heteroptera: Veliidae) from the Philippines 151 (length of metatibia = 1): fore leg 0.69 : 0.63 : 0.34; middle leg 0.87 : 0.90 : 0.53 (0.19 + 0.34); hind leg 0.93 : : 0.69 (0.36 + 0.33) Grasping comb on protibia 0.48 - 0.52 times as long as tibia Metatarsus 0.64 - 0.69 times as long as metatibia, first metatarsal segment 1.09 - 1.18 times as long as segment (Fig 10) Tergites and sternites partly fused Tergite I medially flattened, with postero-medial indentation Second tergite 0.86 - 0.91 times as wide as head Laterotergites raised Genital segments Segment ventrally with circular impression, antero-medially with table-like elevation, anterior and antero-lateral margin of elevation furnished with short hairs; posteriorly three spines, forming a triangle, consisting of compressed tubercles apically bearing tufts of hairs (Figs 2, 4) Pygophore covered with dense, erect hairs, but carrying no tufts of hairs Apterous female Size Length 2.22 - 2.35 mm, maximum width (across suture between metanotum and laterotergite 1) 0.80 - 0.88 mm, width of pronotum 0.70 - 0.75 mm, width of head 0.54 0.58 mm Colour as in apterous male, but horizontal stripe on pronotum not extending onto lateral portions Pilosity as in male, but patch of stout, silvery hairs on tergite postero-medially instead of antero-medially Metatarsal segment without row of short, erect hairs Structural characters Ventral lobe of head and fusion of tergites and sternites as in male Antennae shorter than in male, 0.59 - 0.60 times as long as body, relative lengths of segments - as in male Pronotum 0.47 - 0.54 times as long as wide Protibia without grasping comb Metatarsus 0.51 - 0.56 times as long as metatibia, first metatarsal segment 0.64 0.73 times as long as segment Tergite medially flattened Second tergite 0.91 - 1.00 times as wide as head Laterotergites - wider and more strongly raised than in male Genital segments Proctiger with very dense, short, erect hairs, lateral areas of gonocoxa with long, erect hairs; genital structure as in Figure Macropterous male and female unknown Comparative notes Pseudovelia tenuis sp.n is closely related to P lata sp.n and P borneensis ANDERSEN, 1983 Males of these species can be easily distinguished by the ventral structure of segment (Figs - ; ANDERSEN 1983: figs 35, 36) The grasping comb on the protibia is of similar length in P tenuis sp.n and P lata sp.n (about half length of protibia), but slightly longer in P borneensis (grasping comb : protibia as 30 : 51, from ANDERSEN 1983) In P borneensis the metatarsus of males is only half as long as the metatibia (ANDERSEN 1983), whereas in P lata sp.n it is 0.61 - 0.64 times and in P tenuis sp.n 0.64 - 0.69 times as long as the metatibia Females of P borneensis can be separated from both of the newly described species by the structure of tergite 8, which is produced backward and overlying the genital segments (ANDERSEN 1983: fig 37 [erroneously referred as tergum 7]) In P tenuis sp.n and P lata sp.n tergite is not produced backward that much (Figs 6, 7) ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at 152 Annalen des Naturhistorischen Museums in Wien 101 B Apterous specimens of F tenuis sp.n and P lata sp.n can be distinguished by the maximum body width In P lata sp.n it is larger and measured across tergite 4, in P tenuis sp.n it runs across the suture between metanotum and laterotergite The relative lengths of the antennal segments - can also be used as diagnostic characters In P tenuis sp.n the antennal segment is distincly longest (1.5 - 1.6 : : 1.1 - 1.3 : 1.8 - 1.9; Fig 9), in P lata sp.n it is also longest, but shorter in relation to segment (1.3 - 1.5 : : 1.2 - 1.3 : 1.5 - 1.6; Fig 8), and in P borneensis segments and are of similar length (37 : 23 : 26 : 38, from ANDERSEN 1983) Etymology: "tenuis" (Latin, meaning "slender") refers to the maximum body width, which is smaller than in P lata sp.n and measured across the suture between metanotum and the laterotergite Distribution: Busuanga Island (Fig 1) Habitat notes (Zettel, pers comm.): Site 82 (= 170) is a small, shallow stream in a degraded forest, which is in the dry season an average - metres wide and only in a few places deeper than 0.5 metres The collecting sites were shaded by trees Pseudovelia tenuis sp.n was collected in quiet small bays, one specimen was found between roots hanging into the water Site 81 (= 171) is a small streamlet, an average 1-2 metres wide, flowing through pastures, bordered with trees In 1995 the water was reduced to some remnant pools Site 80b is a very shallow stream of varying width, running through agricultural land, partly bordered by trees All three sites are in the lowland (altitude less than 100 m a.s.l.), close to the sea Pseudovelia tenuis sp.n is a rare species and does not live in aggregations like some other species of this genus Pseudovelia lata sp.n Holotype: (apt.) [PHILIPPINES, PalawanX Mainit Falls, 18 km NVA of Brooks Point, 50m.\CL 2006 VII-26-85X J.T & D.A.Polhemus] (JTPC) Paratypes: 66, 99 (apt.) same data as holotype (JTPC, NHMV); 66 (apt.), 66 (macr.) [PHILIPPINES, Palawan\ Sabsaban Falls, AribongasX 16 km NE of Brooks PointXCL 2007 VII-26-85X J.T & D.A.Polhemus] (JTPC, NHMV) Apterous male Size Length 2.10 - 2.20 mm, maximum width (across tergite 4) 0.87 - 0.90 mm, width of pronotum 0.75 - 0.78 mm, width of head 0.52 - 0.56 mm Colour Head light to dark brown; antennae brown, sometimes with base of segment light brown to yellow Pronotum light to dark brown, with horizontal stripe near anterior margin lighter brown to yellow; black, irregularly distributed, small punctures on pronotum except on stripe Metanotum blackish to dark reddish-brown, sometimes lighter brown with suture between metanotum and laterotergite blackish Legs brown, with basal part of femora yellow Tergites, laterotergite 1, and inner parts of laterotergites - dark brown to blackish, outer parts lighter brown Ventral surface of thorax and abdomen black, stripe on lateral margins of sternites and posterior margin of sternite light brown to dark reddish-brown Pilosity Entire body surface covered with short, decumbent, silvery hairs Long, erect hairs scattered on vertex along margin of eyes, antennae, and legs, hirsute on pronotum, ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at SEHNAL: TWO new species of Pseudovelia (Heteroptera: Veliidae) from the Philippines 153 metanotum, tergites, laterotergites, and sternites Stout, silvery hairs forming stripes on vertex along margin of eyes, and patches at base of vertex, laterally on tergite 1, posteromedially on tergite 6, and on posterior inner parts of laterotergites and 4, sometimes also medially on tergite Metatarsal segment with row of short, erect hairs over entire length, about five hairs at base of segment stout and bristle-like (Fig 11) Eyes naked except for two ocular setae Structural characters Ventral lobe of head not produced backward Antennae 0.69 - 0.72 times as long as body, relative lengths of segments - as 1.3 - 1.5 : : 1.2 - 1.3 : 1.5 1.6 (Fig 8) Pronotum 0.60 - 0.66 times as long as wide Ratio of femur : tibia : tarsus (length of metatibia = 1): fore leg 0.67 : 0.64 : 0.33; middle leg 0.81 : 0.84 : 0.47 (0.16 + 0.31); hind leg 0.80 : : 0.63 (0.32 + 0.31) Grasping comb on protibia 0.49 - 0.52 times as long as tibia Metatarsus 0.61 - 0.64 times as long as metatibia, first metatarsal segment 0.96 - 1.04 times as long as segment (Fig 11) Tergites and sternites partly fused Tergite medially flattened, with postero-medial indentation Second tergite 0.98 - 1.07 times as wide as head Laterotergites raised only a little Sternites - with median notch Genital segments Segment ventrally with posteriad widened impression, with three spines on apical portion, forming a triangle, consisting of compressed tubercles apically bearing tufts of hairs; antero-medially two converging, elevated lobes, carrying a few, very short hairs (Figs 3, 5) Pygophore covered with dense, erect hairs, but carrying no tufts of hairs Macropterous male Size Length 2.27 - 2.30 mm, maximum width (across pronotum) 1.02 - 1.05 mm, width of head 0.56 - 0.58 mm, forewing slightly surpassing end of abdomen Colour Head, antennae, pronotum, and legs of same colour as in apterous male Tergites and inner parts of laterotergites covered by wings; outer parts of laterotergites brown, sutures between laterotergites darker brown Fore wings light brown, with elongate white patch at base of corium Ventral surface of thorax dark brown to blackish, sternites light to dark brown, laterally with blackish stripe, and on lateral margin with light brown stripe Pilosity as in apterous male except for body parts covered by wings Corium with long, erect hairs on anterior margin Structural characters Ventral lobe of head, structure of laterotergites, legs, and sternites as in apterous male Antennae 0.66 - 0.68 times as long as body, relative lengths of segments - as in apterous male Pronotum 0.85 - 0.86 times as long as wide Grasping comb on protibia 0.51 - 0.53 times as long as tibia Genital segments as in apterous male Apterous female Size Length 2.40 - 2.45 mm, maximum width (across tergite 4) 0.92 - 1.00 mm, width of pronotum 0.77 - 0.78 mm, width of head 0.56 - 0.58 mm Colour as in apterous male Pilosity as in apterous male; metatarsal segment without row of short, erect hairs ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at 154 Annalen des Naturhistorischen Museums in Wien 101 B Structural characters Ventral lobe of head and structure of tergites and sternites as in apterous male Antennae shorter than in male, 0.59 - 0.60 times as long as body, relative lengths of segments - as in male Pronotum 0.52 - 0.55 times as long as wide Protibia without grasping comb Metatarsus 0.54 - 0.57 times as long as metatibia, first metatarsal segment 0.67 - 0.71 times as long as segment Second tergite 1.07 - 1.14 times as wide as head Laterotergites - wider and more strongly raised than in male Genital segments Proctiger and gonocoxa with dense, short, erect hairs; genital structure as in Figure Macropterous female unknown Comparative notes see: Pseudovelia tenuis sp.n Etymology: "lata" (Latin, meaning "broad") refers to the maximum body width in apterous specimens, which is larger than in P tenuis sp.n and measured across the tergite Distribution: Palawan Island (Fig 1) References N.M 1983: The Old World Microveliinae (Hemiptera: Veliidae) I The status of Pseudovelia HOBERLANDT and Perivelia POISSON, with a review of Oriental species Entomologica scandinavica 14: 253-268 ANDERSEN, N 1995: Nine new species oi Pseudovelia and a new Xip hove lia (Heteroptera: Veliidae) from Sulawesi (Indonesia) and Mindanao (Philippines) Notes on Malesian aquatic and semiaquatic bugs (Heteroptera), V - Tijdschrift voor Entomologie 138: 69-87, figs 1-58, table NIESER, ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at Ann Naturhist Mus Wien 101 B 155- 161 Wien, Dezember 1999 Notes on Philippine Potamometropsis LUNDBLAD, 1933 (Insecta: Heteroptera: Gerridae) H Zettel5 Abstract Potamometropsis sumaldei sp.n from North Luzon, Philippines, is newly described, which was formerly confused (ZETTEL 1994) with a closely related species, P ikarus ZETTEL, 1994 from South Luzon Records on the other Philippine Potamometropsis species are presented, with first records of P ikarus from Catanduanes, and P werneri aberrans ZETTEL, 1994 from Biliran Notes on the habitats of all species are presented The Philippine Potamometropsis species are classed into two morphologically and ecologically defined groups {P hoogstraali group, P werneri group) Key words: Heteroptera, Gerridae, Potamometropsis, new species, distribution, Philippines, Luzon, Catanduanes, Biliran Zusammenfassung Potamometropsis sumaldei sp.n aus Nord-Luzon, Philippinen, wird neu beschrieben Diese Art ist früher mit P ikarus ZETTEL, 1994 aus Süd-Luzon verwechselt worden (ZETTEL 1994) Fundmeldungen anderer philippinischer Potamometropsis Arten werden gemacht, mit Erstnachweisen von P ikarus für Catanduanes und von P werneri aberrans ZETTEL, 1994 für Biliran Anmerkungen zu den Habitatpräferenzen aller Arten werden gegeben Die philippinischen Potamometropsis Arten werden zwei morphologisch und ökologisch definierten Gruppen (P hoogstraali Gruppe, P werneri Gruppe) zugeordnet Introduction The torrent striders of the Oriental genus Potamometropsis LUNDBLAD, 1933 are inhabitants of fast flowing streams and rivers A taxonomic revision by the author (ZETTEL 1994) contains four species and one subspecies from the Philippine Islands; they are all endemic Potamometropsis ikarus ZETTEL, 1994 was described from material from South Luzon (Camarines Sur) and North Luzon (Ifugao) The more characteristic apterous morph of P ikarus was only available from Camarines Sur, but all specimens from Ifugao were macropterous (mostly dealate) Recently, numerous apterous specimens were collected in North and South Luzon and in Catanduanes, which show several stable differences of the northern "populations" Formerly, some characters distinguishing the specimens from both regions were ascribed to the different morphs or to intraspecific variability (ZETTEL 1994); other differences are not at all present in macropterous specimens Based on the new samplings, the characters have to be regarded as specifically diagnostic; the new species is named Potamometropsis sumaldei sp.n * Dr Herbert Zettel, Naturhistorisches Museum, Zoologische Abteilung, Burgring 7, A-1014 Vienna, Austria ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at 156 Annalen des Naturhistorischen Museums in Wien 101 B In addition, this paper presents new records of the other Philippine species and subspecies First records in the distributional lists are marked with an asterisk (*) Further, the Philippine species are arranged into two species groups Specimens are apterous if not otherwise stated Repositories: BPBM CSW CNTN CZW JTPC NHMW UPLB B.P Bishop Museum, Honolulu, Hawaii, U.S.A Coll Franz Seyfert, Vienna, Austria Coll Nico Nieser, Tiel, The Netherlands Coll Herbert Zettel, Vienna, Austria Colorado Entomological Museum [= Coll John T Polhemus], Englewood, Colorado, U.S.A Natural History Museum Vienna, Austria Museum of Natural History, University of the Philippines, Los Banos, Laguna, Philippines Potamometropsis sumaldei sp.n (Figs 1, 2, 4, 6, 8) Potamometropsis ikarus ZETTEL, 1994: 95 (partim) Holotype (6): "Philippinen: LZ, Mount.Pr [= Luzon, Mountain Province]\ 5km S Bontoc, Balitian Riv.\ 900 m, 27.2.1999X leg H Zettel (190)" (UPLB); paratypes: 66, 99, same label data as the holotype (NHMW, UPLB); 11 66, 14 99, and 66, 10 99 (macropterous, dealate) "Philippinen: LZ, BenguetX Asin Hot SpringsXW Baguio, 17.2.1999\ leg H Zettel (180)" (UPLB, CZW, NHMW, CNTN); 299, (macropterous, dealate) same label data except "leg F Seyfert (4)" (CSW); 14 66, 20 99 "Philippinen: LZ, Mount.Pr A Chico River, GonogonX 1100 m, 21.2.1999X leg H Zettel (184)" (UPLB, CZW); 6, 99 "Philippinen: LZ, Mount.PrA Chico River, GonogonX 1100 m, 21.2.1999X leg F Seyfert (8a)" (CSW, UPLB); 33 66, 22 99 (all macropterous, mostly dealate, labeled as paratypes of P ikarus) "PHILIPPINESX Ifugao ProvinceXJacmal Bunhian\24 km E Mayoyao, 800-X 1000m, 7-8.1 V [or: 9.-12.IV., 16.-18.IV., 19.21.IV., 25.-26.IV., 25.-27.IV., 30.IV., 4.-6.V., 1.-10.V.] 1967", "H.M [or: L.M.] TorrevillasX CollectorX BISHOP MUSEUM" (BPBM, NHMW); (macropterous, dealate, labeled as paratypes of P ikarus) "PHILIPPINESX Ifugao Prov., Liwo\8 km E Mayoyao, 1000-X 1300m, 30.-31.V.1967", "L.M TorrevillasX CollectorX BISHOP MUSEUM" (BPBM); 6, "ILOCOS NTE:\ PIDDIG: TANGA-X DAN C NURSERYXPARAISO RE-XFOR PROJECTX21 OCT 1976XA.A BARROSO" (CZW) (numerous specimens from this locality in UPLB, not examined for this study) Description: Apterous male: Body length 5.6 - 6.2 mm; body width 1.90 - 2.06 mm; length of second antennal segment 0.80 - 0.88 mm; length of mesofemur 8.0 - 8.4 mm Colour: Head yellow (in living specimens body marks are greenish, but turn to yellow after preservation), with two black marks on vertex not or hardly confluent, and clypeus, labrum, and antennal tubercles black; antenna completely black; rostrum yellow, except segment blackish; pronotum dorsally black, with large yellow middle spot in posterior three fourths; meso- and metanotum without yellow marks; all thoracic nota with distinct greenish metallic shimmer; laterotergites and tergites 1-6 black; tergite black, with narrow yellow hind margin; propleura yellow, meso- and metapleura black; venter black except prosternum, all acetabula, thin midline anteriorly on mesostemum, and line along hind margin of sternite yellow; segment yellow, dorsally with black roundish mark; pygophore yellow; proctiger yellow with large black mark; coxae, trochanters, profemur, and basal thirds to half of meso- and metafemora yellow; distal parts of legs black; profemur with a narrow black line on dorsal surface, rarely with an additional faded line on ventral surface ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at ZETTEL: Notes on Philippine Potamometropsis (Heteroptera: Gerridae) 157 Figs - 9: (1, 2, 4, 6, 8): Potamometropsis sumaldei sp.n., (3, 5, 9): P ikarus; (1) foreleg of male; (2, 3) proctiger of male; (4, 5) left paramere lateral view; (6, 7) posterior margin of female sternite in lateral view; (8, 9) middle lobe of female sterilite 7, in ventral view, hind margin turned upward, upper lines showing variations Pilosity: Whole body covered with a relatively dense, short, whitish pubescence, which in several parts undulate, mostly decumbent to appressed, and only on sternites suberect, densest on venter and pleurae, least dense medianly on meso- and metanotum; additional silverish pubescence not very distinct from whitish pubescence, forming lines between thoracic nota and pleurae, two pairs of small roundish spots on mesonotum and at mesometanotal suture, and indistinct marks in the lateral parts of tergites - 7; without erect setae except rows along inner eye margin Structural characters: Head with very large eyes; synthlipsis 0.48 times head width; relative lengths of antennal segments - (segment = 1) as 3.0 : : 1.1 : 0.85 Prothorax 1.25 times as wide as head, 2.1 times as wide as long; meso- and metanotum together distinctly longer than the abdomen until hind margin of segment ( 1.45 times); protemur slender, 7.0 times as long as wide, 0.33 times as long as mesofemur, ventrally with numerous small denticles and row of black setae, with indistinct ventral depression and one very small tooth subapically (Fig ); protibia weakly flattened, 0.84 times profemur length, with a ventral row of black denticles; combined length of protarsal segments 0.55 times tibia length; second segment of protarsus 0.57 times as long as segment (Fig 1); melafemur length 0.95 times mesofemur length Abdomen: Laterotergites strongly upward directed; tergites and subequal in length and longer than each of tergites - 6; tergite wider than long (1.4 times) and as long as tergites - combined; segment large; pygophore in posterior half with convergent sides; proctiger distally rounded, laterally with short projecting angles (Fig 2); paramere distally slender, distinctly twisted, and set with numerous setae (Fig 4) ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at 158 Annalen des Naturhistorischen Museums in Wien 101 B Apterous female: Body length 7.5 - 7.9 mm; body width 2.49 - 2.75 mm; length of second antennal segment 0.84 - 0.90 mm; length of mesofemur 9.0 - 9.6 mm Colour similar as in male, but lighter: With large yellow mark along midline of mesonotum; antennal segment with light brownish ring in basal fourth; lateral margins of laterotergites - yellowish; venter largely yellow, except two very large black marks anterolaterally on mesosternum Pilosity as in male, except thoracic pleurae additionally with thin, erect, whitish setae; and venter throughout with short appressed (not suberect) pubescence Structural characters differing from male as follows: General appearance broader, with much longer abdomen; prothorax 2.2 times as wide as long; meso- and metanotum together distinctly shorter than the abdomen until hind margin of segment (0.85 times); profemur more slender, 10.0 times as long as wide, without ventral denticles, without subapical tooth; protarsus 0.75 times protibia length, second segment 0.52 times segment Abdomen elongate, similar as in P ikarus (see ZETTEL 1994: fig 64); tergite medially longer than each of tergites 1, 3, 4, and 5, and subequal to tergite 6; tergite longest, 1.0 1.15 times longer than basal width, and longer than tergites and combined; tergite directed caudad, longly surpassing tergite 7; sternite large, posteriorly with relatively small, short middle lobe with slightly to distinctly concave hind margin (Fig 8), in lateral view with distinctly postward directed connexival corners (Fig 6) Macropterous morph: body length (until tip of abdomen) of male 5.9 - 6.3 mm, of female 7.5 - 8.0 mm; pronotal lobe large, broad, with prominent humeral angles and anteriorly weakly developed median carina, with thin greyish pubescence; most specimens dealate; wings yellowish brown with brown veins, venation see ZETTEL (1994: fig 59) Comparative notes: Potamometropsis sumaldei sp.n is very closely related to P ikarus from which it can be distinguished by the following characters: character (+) = only in apterous morph Potamometropsis sumaldei sp.n Potamometropsis ikarus dark mark on head: profemur: two separated stripes weakly infuscated (Fig 1) ca 0.55 times segment thick, whitish acute angle (Fig 6) posteriorly concave (Fig 8) medianly confluent strongly infuscated ca 0.65 times segment thin, greyish obtuse angle (Fig 7) segment of protarsus: pilosity of thoracic nota (+): 9: connexivum 7: ỗ: lobe of sternite 7: with yellow midline ỗ: mesonotum (+): ç: length of tergite 7: d: proctiger: equal or longer than basal width with obtuse lateral angles (Fig 2) 6: paramere: distally slightly twisted (Fig 4) posteriorly straight or convex (Fig 9) completely dark shorter than basal width with reduced lateral angles (Fig 3) distally not twisted (Fig 5) ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at ZETTEL: Notes on Philippine Potamometropsis (Heteroptera: Gerridae) 159 Distribution: Luzon: Mountain Province*, Ifugao*, Benguet*, Ilocos Norte* Habitats: Potamometropsis sumaldei sp.n is a species of large streams and rivers, where it inhabits the water surface behind large rock boulders, where the water velocity is reduced There it lives in large swarms, both adults and larvae mixed In the Balitian River, Mountain Province, it was found in a more open, evenly flowing area, where adult specimens were mostly found in couples; this habitat resembles that of Cylindrostethus vittipes STÂL, 1870, but it could be also the result of previous disturbence by the collecting or by fishing activities Collecting data are from elevations between 800 - 1300 m Etymology: In friendship and with gratitude dedicated to Prof Dr Augusto C Sumalde, director of the Museum of Natural History, University of the Philippines Los Banos, an Ilocano like this species Notes on the other Philippine species Potamometropsis ikarus ZETTEL, 1994 (Figs 3, 5, 7, 9) Potamometropsis ikarus ZETTEL, 1994: 95 (partim) Material examined: holotype (macropterous 6, BPBM) and paratypes (2 66, 99, BPBM, NHMW): "P.I., CAMARINESXSUR Mt Iriga\500m, 25.III.1962", "H.M TorrevillasXCollectorX Bishop" (BPBM); additional material: 66, 99, and 99 (macropterous, alate) "Philippinen: LZ, CamarinesX Sur, Lupi, AlanaoXBahi River, 3.3.1999X leg H Zettel (191)" (NHMW, UPLB); 66, 99 same label data except "leg F Seyfert (18)" (CSW, UPLB); 13 66, 10 99 "Philippinen: LZ, AlbayX Malinao, Palali Falls\200 m, 14.3.1999Xleg H Zettel (201)" (NHMW, UPLB, JTPC); 35 66, 30 99 "Philippinen: CatanduanesXN Bato, S San MiguelX Balongbong Falls, 7.3A 1999, leg H Zettel (195)" (NHMW, UPLB, JTPC, CNTN); 66, 99, same locality data, except "leg F Seyfert (21)" (CSW, UPLB) Revised distribution: Luzon: Camarines Sur, Albay*; Catanduanes* Habitats: similar as in P sumaldei sp.n., but collected in lowlands and hilly areas from 50 - 500 m a.s.l Potamometropsis werneri werneri HUNGERFORD, 1957 Potamometropsis werneri HUNGERFORD 1957: 127 Potamometropsis werneri werneri ZETTEL, 1994: 93 Additional material examined: 66, 99, (macropterous) "PHILIPPINEN: MindanaoX Bukidnon, 8km NW Lantapan\ Sonka, Alanib River, 950m\ 8.11.1996, leg.Zettel (92)" (NHMW); 20 66, 18 99 "PHILIPPINEN: MindanaoX Bukidnon, 4km NE LantapanX Kaatuan, Kulasihan Riv.,850m \9.11.1996, leg.H.Zettel (93)" (UPLB, NHMW) Distribution: Mindanao: Misamis Oriental, Bukidnon*, South Cotabato, Sarangani Habitats: similar as for P sumaldei sp.n., but also in middle sized streams, and collecting data from 450 - 950 m a.s.l Potamometropsis werneri aberrans ZETTEL, 1994 Potamometropsis werneri aberrans ZETTEL, 1994: 95 Additional material examined: 66, 99, and (macropterous, dealate) "Philippinen: MindanaoX Misamis occ, W OzamizXTangub, Gala, Lobo River\7.3.1997,lg.Zettel (125)" (CZW, UPLB); (macro- ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at 160 Annaìen des Naturhistorischen Museums in Wien 101 B pterous, dealate) "Philippinen: MindanaoX Zamboanga d.Sur, 12 km\ N Pagadian, Alegria FallsX 9.3.1997,1g Zettel (126)" (CZW); 66, 99 "Philippinen: Mindanao, Zambo-X anga d.Sur, 25 km NW PagadianX Deborok - Lourdes/Tubangan Riv.X 11.3.1997, lg H.Zettel (128)" (UPLB, CZW); dd, 11 99 "Philippinen: BiliranVSE Almeria, BalagombongX Falls, 14.3.1998X leg H Zettel (161)" (UPLB, CZW) Notes: The presence or absence of a metanotal tubercle in females (see ZETTEL 1994) varies in both subspecies and therefore is not useful to separate females, which can only be distinguished by the slightly different lengths of the antennal segment Male diagnostic characters (see ZETTEL 1994) proved to be useful to distinguish all populations studied Distribution: Mindanao: Zamboanga del Norte, Zamboanga del Sur*, Misamis Occidental*; Leyte; Biliran* Habitats: similar as for the nominate subspecies, but also found in lower and higher altitudes; and, rarely, in relatively small streams Potamometropsis luzonica ZETTEL, 1994 Potamometropsis luzonica ZETTEL, 1994: 86 Additional material examined: 66, 99 "Philippinen: LZ, Mount.Pr.\ Chico River, GonogonX 1100 m, 21.2.1999\leg H Zettel (184)" (UPLB, CZW); 66, 99 "Philippinen: LZ, Mount.Pr.X Chico River trib., GonogonX 1100 m, 21.2.1999\ leg F Seyfert (8b)" (CSW, UPLB); 66, 99 "Philippinen: LZ, Mount.Pr.X NE Sagada, Banga'anX Bomod-ok Wf., 22.2.1999X 1500 m, leg.H.Zettel (185)" (UPLB, CZW); 66, 99, same label data, except "leg F Seyfert (9)" (CSW, UPLB); 66,6 99 "Philippinen: LZ, Mount.Pr.X Sagada, Echo Valley, Under-X ground River, 23.-24.2.1999X 1500 m, leg H Zettel (186)" (NHMW, UPLB); 66, 99 "Philippinen: LZ, Mount.Pr.X S Sagada, Bagnen, slopes of X Mt.Polis, 1600 m, 26.2.X 1999, leg H Zettel (189)" (NHMW, UPLB); d, 99 "Philippinen: LZ, Mount.Pr.X S Sagada, Bagnen, slopes of\ Mt.Polis, 1550 m, 26.2.X 1999, leg H Zettel (189b)" (NHMW, UPLB); "Philippinen: LZ, Mount.Pr.X 5km S Bontoc, Balitian Riv.X 900 m, 27.2.1999X leg F Seyfert (16)" (CSW); 66, 99 "PHILIPPINEN: Laguna Pr.X Los Banos, Mt.MakilingX Molawin Creek,Flat StonesX 9.2.1996, leg.Zettel (75)" (CZW, UPLB); 66, 99 "Philippinen: Camarines Sur\20km E Naga, 5km E CarolinaX Mt Isarog,nr Malabsay FallsX 4.3.1999, leg Zettel (192)" (NHMW, UPLB) Distribution: Luzon: Mountain Province*, Ifugao, Benguet, Laguna, Quezon, Camarines Sur Habitats: In or close to rushing currents of small and middle sized streams, collected in altitudes from 200 - 1600 m a.s.l The habitat preferences off luzonica and P sumaldei sp.n could be best observed in Gonogon, Mountain Province, where P sumaldei sp.n inhabits the Chico River, but nearly all specimens of P luzonica were collected in a small, rushing tributary Potamometropsis hoogstraali HUNGERFORD, 1957 Potamometropsis hoogstraali HUNGERFORD, 1957: 125 - ZETTEL 1994: 85 Additional material examined: 66, 99 "PHILIPPINEN: MindanaoX Bukidnon,8km NW LantapanX Sonka, Alanib River, 950m\8.11.1996, leg.Zettel (92)" (NHMW, UPLB) Distribution: Mindanao: Misamis Oriental, Bukidnon, Davao Habitats: In or close to rushing currents of middle sized mountain streams in 950 -1480 m a.s.l ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at ZETTEL: Notes on Philippine Potamometropsis (Heteroptera: Gerridae) 161 Classification The Philippine Potamometropsis species can be classed into two groups, which are defined morphologically and ecologically as follows: Potamometropsis hoogstraali group (including P hoogstraali, P luzonica): relatively large, stout species (body length 8.2 - 10.8 mm); male with strongly enlarged forefemur and foretibia, slightly smaller (P hoogstraali) or larger (P luzonica) than female; thoracic nota with more extended greenish (yellowish in preserved specimens) marks Species living in and close to rushing, turbulent currents, usually in small to middle sized streams Several species from Borneo (see POLHEMUS & ZETTEL 1997) seem to be related with this group Potamometropsis werneri group (including P werneri, P ikarus, P sumaldei): relatively small, slender species (body length 5.9 - 8.1 mm); male with slender forefemur and foretibia, distinctly smaller than female; thoracic nota predominately black Species living in fast, but less turbulently flowing middle sized to large streams The relationship with P anomalis CHEN & NIESER, 1992 from Sulawesi is doubtful Acknowledgements I wish to thank Prof Dr V.P Gapud (UP Los Banos), Dr D.A Polhemus (formerly BPBM), and Mag F Seyfert (Vienna) for the loan of material and gift of reference specimens used for this study The continuous support of the PWBIP by Prof.Dr A.C Sumalde (UP Los Banos) is gratefully acknowledged I further thank all my Philippine friends, who supported my work in the Philippines, especially Salvacion, Ana, and Ely Vichoso and Rowena Madrideo, who have taken me to the Bahi River area; and Dr S Schödl (NHMW) and Mag F Seyfert for the pleasant accompany during the 1999 trip Finally my thanks are due to Prof Dr Carl W Schaefer (Storrs) for a linguistic review, and to Prof.Dr Pingping Chen (Beijing) and to an anonymous reviewer for helpful comments on the manuscript References H.B 1957: Two new Gerrids from the Philippines (Hemiptera, Gerridae) Journal of the Kansas Entomological Society 30(4): 125-130 POLHEMUS, J.T & ZETTEL, H 1997: Five new Potamometropsis species (Insecta: Heteroptera: Gerridae) from Borneo - Annalen des Naturhistorischen Museums in Wien 99B: 21-40 ZETTEL, H 1994: Revision der Gattung Potamometropsis LUNDBLAD (Insecta: Heteroptera: Gerridae) - Annalen des Naturhistorischen Museums in Wien 96B: 75-98 HUNGERFORD, ... download unter www.biologiezentrum.at 36 Annalen des Naturhistorischen Museums in Wien 101 B Entomologists are only beginning to study Philippine insects Described insects are still very few, probably... subgenital plate weakly emarginated (Fig 35) (widespread) N pumilus sp.n ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at 58 Annalen des Naturhistorischen Museums in Wien 101 B... ZETTEL 1998a, b) ©Naturhistorisches Museum Wien, download unter www.biologiezentrum.at 38 Annalen des Naturhistorischen Museums in Wien 101 B Presently, published results of PWBIP are mostly taxonomically