... including JH-I, JH-II, JHIII, and JH-0 The occurrence of mixed-JH-producing insects (such as the tobacco hornworm, Manduca sexta) TIC 03 5/20/04 4:48 PM Page 61 The circulatory system Fig 3. 8 The main ... ringed hose of a vacuum cleaner) The cuticular linings of the tracheae are shed with the rest of the exoskeleton when the insect molts Usually even the linings of the finest branches of the tracheal ... treatment, and to relevant chapters in the Encyclopedia of Insects (Resh & Cardé 20 03) 3. 1 MUSCLES AND LOCOMOTION As stated in section 1 .3. 4, much of the success of insects relates to their ability to...