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. a, larva; 5, 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 larve of beetles are called grubs. 
Examples of beetles and their transformations are the pine 
Fig. 886 —June Beetle and its transformations, 1, pupa; 2, larva.—After Riley. 
weevil (Fig. 335, Pussodes strobt Peck) and the June beetle 
(Fig. 336, Lachnosterna fusca Frohl.). The oil beetle is 
remarkable for passing through three larval stages (Fig. 
