THE \n< [pterA. 



12 



cocoon. Such are the lace- winged fly (Fig. 154), the ant- 

 lion, and Corydalus. The aphis-lion is the larva of the 

 lace-winged tlv, and devours large numbers of plant-li 

 Order 10. Mecoptera. — The type of this group is Pano\ 

 Order 1 I. Trichoptera. — The case-worms are the larvae of 

 moth-like insect a called ( 'addis-flies. Their wings are veined 

 in in -h as in the smaller moths. Their larvae re.-' •nil,!. 

 pillars, but live in water, in cases (Fig. 155). 



Order L2. { 'oleop.tera. — In beetles the fore-wings arc thick- 

 ened, not used in flight, and form sheaths (elytra), which 



Fio. 166.— Metamorphosis of the May-beetle; 8, larva; i. papa. 



protect the under or hinder pair. Their young are railed 

 grubs; the pupae usually rest in cocoons of earth, etc., their 

 metamorphosis being complete (Fig. 156). The tiger and 

 ground beetles have long sharp jaws for Beizing other 

 insects; they are the of the insect world. The bury- 



mg-beetles are scavengers, and useful insects they are. 

 The leaf-beetles are very numerous, and comprise as in the 

 potato-beetles (Fig. 157) some of our most destructive in- 

 sects. Injurious to trees and fruit are the boring-beetles 

 and the weevils. The latter with their long beak, at the 



