372 



ZOOLOd T. 



Order 5. 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. 340. Pine weevil, a, larva; b, pupa. 



or wing-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 



Fig. 341. June Beetle and its transformations. 1, pupa; 2, larva. After Riley. 



weevil (Fig. 340, Pissodes stroli Peck.) and the June beetle 

 (Fig. 341, Lachnosterna fusca Frohl.). The oil beetle is 

 remarkable for passing through three larval stages (Fig. 



