184 TRICHOPTERA. 



(pleurites) ; while the long, slender abdomen recalls 

 the shape of that of moths. Moreover, the body and 

 wings, usually hairy, are sometimes covered with scales, 

 and the venation is somewhat as in moths." It is also 

 to be observed that the abdomen is sessile, as in the 

 Lepidoptera. It is very difficult, in view of these 

 affinities of the adult caddis-flies with the moths, to 

 escape forming the conclusion that the Trichoptera 

 had a common origin with the Lepidoptera. 



