88 



INSECTS 



The larvae have the jaws and other mouth parts well 

 developed and feed upon other soft-bodied aquatic 

 forms. They assist in checking the increase of the 

 May-flies and stone-flies, and are themselves hunted 

 by fish, which keep them down to normal numbers. 



CL 



FIG. 35. The " hellgrammite " or "Dobson": a, larva; b, pupa; c, male adult; 

 d, head of female. 



The order Neuroptera, strictly speaking, contains 

 only predatory forms and the beginning of parasitic 

 habits. With few exceptions the species are terrestrial. 

 The families Coniopterygidce, Chrysopidce , Hemerobiidcz 

 and Myrmeleonida , are rather similar in the larval 



