oil stalks. (Natural size.) 



Ex- 



Fig. 1116.— Panorpa or Scorpion 

 Fly. 



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-wi7iged Flies.— Insects ot the order Neuroptera 

 (Greek, nerve-wings) have 

 free jaws adapted for bit- 

 ing; the tongue (ligula) is 



entire, large, broad, and Fig. llla.-Chrysopa and its eggs placed 



rounded, while the pro- 

 thorax is large and square, 

 amples of the order are Oory- 

 dalus, the lace-winged fly {Chry- 

 sopa), and the ant-lion. The 

 'iydung of the lace-winged fly has 

 great sickle-shaped jaws, and 

 feeds on Aphides. 



The Scorpion Flies. — These insects rep- 

 resent the order Mecoptera. Their wings 

 are narrow and long, hence the name of 

 the order (Greek, mecos, length). They are 

 net-veined insects, but differ from the 

 Neuroptera in having larvse like caterpil- 

 lars; while the head of the adult is elongated 

 and beaked, with minute jaws at the end 

 of the snout. 



The Caddis Flies. — These constitute the 

 order Trichoptera (Greek, thrix, 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, „,i"ict. iiic— Caddis 



,.,.,.- . ., ,. Fly and Case-worm. 



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

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

 of sand or bits of leaves. 



* Literature. — Hagen's Synopsis of N. A. Neuroptera. 



