238 



Denning: Trichoptera 



antenna 



median ocellus 

 anterior wart 

 compound eye 

 lateral ocellus 



postero-lateral wart, 

 pronotum 



tejula.--- *" y$cuf umll" 

 mesonotum J scutellum . . . l v 

 ^postnotum.. t 



metanotum 





f * mur ' tibia'' tarsus^ 



T *S. 



claws-—* 



Epical spurs 

 preapical spurs 



Fig. 10:1. Rhyacophila lobifera, illustrating terminology of 

 structures of adult Trichoptera (Ross, 1944). 



most of its time with its head near the net ready to 

 pounce on any prey. When disturbed, it backs out of 

 the net or retreats with great agility. The flexible 

 body structure enables the larva to move backward 

 rapidly, but it can move forward only slowly. 



"Tube-Making Forms. — Some psychomyiid larvae, 

 notably of the genus Phylocentropus, burrow into 

 sand at the bottom of streams, cementing the walls 

 of the burrow into a fairly rigid structure which may 



be dug out intact. The mechanics of food gathering 

 in this group are not well understood. 



"In both the net-spinning and tube-making forms, 

 pupation takes place in the end of the tube or retreat. 

 The larva constructs a cocoon of leaf fragments, 

 stones or whatever other material is available, lining 

 it with silk. The pupa is formed here. 



"Saddle-Case Makers. — Larvae of the rhyacophilid 

 subfamily Glossosomatinae make a portable case 



