CHAPTER XVI. 



THE NET-VEINED INSECTS WITH A COMPLETE META- 

 MORPHOSIS. 



WE now come to insects with a complete metamorphosis, 

 the larva being more or less worm-like. 



The Lace-winged Flies. Insects of the order Neuroptera 

 (Greek, nerve-wings) have 

 free jaws adapted for bit- 

 ing ; the tongue (ligula) is 

 entire, large, broad, and FIG. iiia. ciu-ysopa and its eggs placed 



-. -, 1-1 ,1 on stalks. (Natural size.) 



rounded, while the pro- 

 thorax is large and square. Ex- 

 amples of the order are Cory- 

 dalus, the lace- winged fly ( Chry- 

 sopa), and the ant-lion. The 

 young of the lace-winged fly has 

 great sickle-shaped jaws, and 

 feeds on Aphides. 



The Scorpion Flics. These insects rep- 

 resent the order Mecaptera. Their wings 

 are narrow and long, hence the name of 

 the order (Greek, mecas, long). They are 

 net-veined insects, but differ from the 

 Neuroptera in having larvae like caterpil- 

 lars; while the head of the adult is elongated 

 and beaked, with minute jaws at the end K 

 of the snout. 



The Caddis Flies. These constitute the 

 order Triclioptera (Greek, tlirix, trichos, 

 hair ; the wings being quite hairy). The 

 caddis flies closely resemble the smaller 

 moths ; as in moths the jaws are absent or 

 obsolete, but well developed in the larva, 

 which is called a case-worm, since it lives , its case (enlarged). 

 in water, in a tube or case which it constructs from grains 

 of sand or bits of leaves. 



FIG. 111/). Panorpa or Scorpion 

 Fly. 



