353 



ZOOLOGY. 



Order 12. CoUoptera. — The beetles form a homogeneous 

 and easily circumscribed group, all having the fore-wings 

 thickened, not used in flight, and forming sheatlis {elytra 



Fig. 335 —Pine weevil, a, larva ; 6, pupa. 



or ■wing-coTers) for the hinder pair. The mouth-parts are- 

 free and adapted for biting. The metamorphosis is com- 

 plete. The young or larvas of beetles are called grubs. 

 Examples of beetles and their transformations are the pine- 



rig. 336 —June Beetle and its transformations', 1, pnpa; 2, larva. — After Eiley. 



weevil (Fig. 335, Pi'ssodes slrobi Peck) and the June beetle- 

 (Fig. 33Q,. Lachnoslerna fusca Frohl.). The oil beetle is 

 remarkable for passing through three larval stages (Fiw. 



