352 



ZOOLOGY. 



Order 12. Coleoptera. The beetles form a homogeneous; 

 and easily circumscribed group, all having the fore-wings 

 thickened, not used in flight, and forming sheaths (elytra 



Fig. 335 Pine weevil. , larva ; b, pupa. 



or \vino--covers) for the hinder pair. The mouth-parts are- 

 free and adapted for biting. The metamorphosis is com- 

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

 Examples of beetles and their transformations are the pine 



Tig. 330 June Beetle and its transformations 1, pupa; 2, larva. After Riley; 



weevil (Fig. 3:35, Pissodes slrobi Peck) and the June beetle- 

 (Fig. 336, LacJinosterna fusca Frohl.). The oil beetle is 

 remarkable for passing through three larval stages (Fig. 



