BARK-BEETLES ; ENGRAVER-BEETLES. 



221 



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



ally serrate, and the pygidium is surrounded at the edge by the 

 wing-covers, which have the 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 larvae are similar to those of the genuine Curculionidae , 

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

 Their method of doing so is very peculiar, and differs 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 



