144 NKUROPTERA. 



The perfect insect bears some resemblance to a 

 Dragon-fly. 



The larva; maybe found, during the entire summer, 

 in sand, at the base of cliffs, in the ravines about Ith- 

 aca. 



Phryganeid^. {Caddis-worms, or Case-worms). 



The members of this family differ so much from 

 other Neuroptera that they are considered by many 

 entomologists as a distinct order, the Trichoptera of 

 Kirby. 



Some of the adult insects strongly resemble moths, 

 for which they are often mistaken. The body is 

 hairy; the head is small, with long antenna.-, and im- 

 perfectly developed mouth-parts ; the wings are de- 

 flexed at the sides, when not in use ; and the legs are 

 long. 



The larvae are very common (at Ithaca) in all our 

 streams, and in the Lake. They are long, cylindrical, 

 soft-bodied, and furnished with six well developed 

 thoracic legs, and a pair of anal legs. The mouth- 

 parts are formed for biting. The abdomen bears nu- 

 merous respiratory filaments. 



The young larva protects its soft body by building 

 a case in which it lives. These cases are composed of 

 various materials, .sticks, leaves, .stones, shells, etc., 

 fastened together with silk, or are made entirely of 

 silk. Some of them are portable, others are attached 

 to stones or other objects. As the larva increases in 

 size, it enlarges its case by making additions to the an- 

 terior end. 



Note different forms of cases. 



The silk "is spun from a spinneret, placed at the 



