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. 



Fig 35. — The "hellgrammite" or "Dobson": a. larva; 6, 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 Coniopterygidcs, ChrysopidcB, HemerohiidcB 

 and Myrmeleonidcs, are rather similar in the larval 



