TEE MECAPTEBA. 



123 



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

 lion, and Cory dal lift. The aphis-lion is the larva of the 

 lace-winged fly, and devours large numbers of plant-lice. 



Order 10. Mecoptera. — The type of this group is Panorpa. 



Older 11. Trichoptera. — The case-worms are the larvae of 

 moth-like insects called Caddis-flies. Their wings are veined 

 much as in the smaller moths. Their larvffi resemble cater- 

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



Order 13. Goleoptera. 

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



-In beetles the fore-wings are tliick- 



FiG. 156.— Metamorpho'^is of the May beetle, 2 laiva, 1 pupa. 



protect the under or hinder pair. Their young are called 

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

 metamorphosis being complete (Fig. 166). The tiger and 

 ground beetles have long sharp jaws for seizing other 

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

 ing-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 



