SMITHSONIAN MISCELLANEOUS COLLECTIONS V66

^:^ - 'V/ ^ "Vy , V A 'm^: ^"^ ^ "?H>i' iftt'N,' X (SEE EXPLANATION OF PLATES AT END OF TEXT.) PLATE 11 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL 142, 'v/v^";::'^ / ,/J«'"^ it? ^L "k '% a^ * (SEE ' K EXPLANATION OF PLATES AT END OF TEXT.) NO PLATE HSONIAN MISCELLANEOUS COLLECTIONS (SEE EXPLANATION OF PLATES AT VOL END OF TEXT.) 142 NO PLATE 13 VOL SMITHSONIAN MISCELLANEOUS COLLECTIONS -i*-~j;, ^r^- (SEE EXPLANATION OF PLATES AT END OF TEXT.) 142, NO PLATE ^^ & \ ^O ^iS ^ ]^^ ^^ \ ^o '-> -4 ... principal sense organs at the forward end of the body SMITHSONIAN MISCELLANEOUS COLLECTIONS, VOL »«ITh INSTlTU HON 142, NO SMITHSONIAN MISCELLANEOUS COLLECTIONS Since this end comes food, the mouth... THE SMITHSONIAN INSTITUTION NOVEMBER 4, 1960 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 142 NUMBER FACTS AND THEORIES CONCERNING THE INSECT HEAD By R E SNODGRASS Honorary Research Associate Smithsonian. .. SMITHSONIAN INSTITUTION 1962 PORT CITY PRESS, INC BALTIMORE, MD., U S A //^.6^' ADVERTISEMENT The Smithsonian Miscellaneous Collections series contains, since the suspension in 1916 of the Smithsonian