than the first. The larva cleans the meshes of the net; the threads always 

 appear brilliant silvery; the net is cleaned with the brushes on the labrum, 

 the pectinate form of the hairs of the brush (Figure 128) assists in the 

 cleaning. The general appearance of the capturing net of the full-grown 

 larva of Hydropsyche is illustrated in Figure 129. 



PUPA 



General description 



The pupa of Trichoptera (Figures 130 and 1 3 1 ) are free or exarate pupae 

 (pupa libera); the appendages of head and thorax are free and articulate with 

 the body only at the base. Unlike many free pupae, the pupa of caddis flies 

 is very active, making movements both inside the pupal case and when 

 emerging from it; the pupa swims for some time and then crawls out of the 

 water. 



[a?) 



FIGURES 130 and 131. General appearance of pupa: 



130 — A mphipsyche prolut a, lateral (Annulipalpia); 131 — Li mno philu s fla 

 vi corn is, dorsal (integripalpia) (after Ulmer). 



79 



