BARK-BliETLES ; ENGRAVER-BEETLES. 



221 



mwM 



Fig. 235. — a, work of Bostrichvs; b, that of Eccoptogaster. After Brehm. 



ally serrate, atid the pygiditim is surrounded at the edge by the 

 wing-covers, whicli have tlie fold on the inner side well de- 

 veloped. In many cases the edges of the declivity of the wing- 

 covers are toothed or serrated in various ways, though in others 

 they are normal. They also differ from the other snout-beetles in 

 possessing a very short snout, which is scarcely more than a slight 

 prolongation of the head. 



The larv?e are similar to those of the genuine Curculionidac, 

 but have stronger jaws to adapt them for boring into hard wood. 

 Their method of doing so is very peculiar, and ditfers in the dif- 

 ferent genera composing this family. Some bore between the 

 bark and solid wood, several working from a common center; 

 the burrows, which gradually widen to the place of exit, radiate 



