316 



INTRODUCTION TO ZOOLOGY 



CHAP. 



The Larva. 



The larva, when full grown, is about half an 

 inch long, and of a pale pinkish-yellow colour. It 

 l>ears round its mouth 

 - _^' f\. specially modified sickle- 

 ^^jj&e~. shaped jaws, with which 



it pierces the body of its 

 prey and sucks up its 

 juices. In this way it de- 

 stroys large quantities of 

 green-fly. 



Finally, it 

 spins round it- 

 self a little, almost globular 

 cocoon of silk threads, 

 which are given out from 

 the last segment of the tail, 

 and manipulated by the 

 jaws into the required 

 shape. 



The Pupa. 



FIG. 238. The Lacewing-fly 

 (Chrysopa vulgaris). 



A, Cluster of eggs ; B, rose' twig infested by 

 Aphides, a, and harbouring the lacewing- 

 fly in various stages ; e, larva of lacewing- 

 fly ; p, pupa ; i, imago. 



FIG. 239. 

 Larva of Lacewing-fly. ( x 4. ) 



Family 6 : PHRYGANEIDAE (sometimes called TRICHOPTERA) 

 (CADDIS-FLIES) 



Caddis-flies differ in several respects from the more typical 

 Neuroptera. Specially to be noted in them are the hairs that 

 more or less cover the wings, and make them somewhat 



