422 



ARTHROPODA 



the ant lions (fig. 467) recall the dragon flies; the Chrysopinae, the Perlidae. The 

 Neuroptera, however, are holometabolous and have a resting stage, although 

 the pupae (pupae liberae) are capable of some motion. 



Sub Order I. PLAXIPENNIA. Biting mouth parts. SIALID^E, wings 

 well developed, larvae aquatic. Corydalis* hellgrammite (fig. 468); Sialis.* 

 HEMEROBIID.-E, lace wings; wings well developed; larvae with sucking mouth 

 parts, predaceous. Chrysopa* feeds on plant lice; ^fyn}leleo* ant lions (fig. 

 467); larvae dig pits and capture ants, etc., which fall into them. PAXORPID^E 



FIG. 468. Corydalis cornutus,* hellgrammite, male (from Riley). 



(Mecoptera) ; mouth prolonged into a rostrum; Bittacns* Sub Order II. TRI- 

 CHOPTERA (caddis flies). Wings usually large; mouth parts rudimentary, 

 forming a short sucking tube which, with the wings covered with hair-like scales 

 recalls the Lepidoptera; larvae aquatic with trachea! gills; build cases of foreign 

 matter, stones, sticks, etc., in which they live like a hermit crab Phrvsauca * 

 Hydropsyche* 



Order V. Strepsiptera. 



SIYI.OPID/E are parasitic on Hymenoptera. The six-legged larvae (fig. 469, 

 3) press in between the ventral abdominal plates of bees or wasps and pupate 



