524 COLEOPTERA OF NORTH AMERICA. 



the absence of the hood-like prolonj^atiou of the prothorax. We 

 have, therefore, thought it best to remove it from that position, 

 and place it with Dolurgus, as a separate group. Though differ- 

 ing in the antennal club, which is solid in Crypturgus, and annu- 

 lated transversely with the first joint corneous in Dolurgus, these 

 two genera are otherwise closely related, and differ remarkably 

 from neighboring forms by the small number of joints in the 

 fuuicle. The prothorax is elongate-oval, rounded in front, nearly 

 truncate at base; the scutellura is very small, not depressed, and 

 the basal edge of the elytra is not elevated. The elytra are 

 elongate-cylindrical, with the posterior declivity convex ; the 

 strias arc well marked, and strongly punctured; the interspaces 

 narrow, finely punctulate and slightly pubescent. The ventral 

 sutures are straight and deep ; the first and fifth segments are 

 longer than the others. The prostornura is very short, not ex- 

 cavated; the front coxa3 are contiguous; the tibite are dilated 

 and finely serrate; the terminal spur is very small; the tarsi are 

 slender, with the third joint not dilated. 



Antennal club solid; funicle 2-jointed. Crypturgus. 



Antennal club annulated ; funicle 3-jointed. Dolurgus. 



One species of Crypturgus in the Atlantic region, and one of 

 Dolurgus in Alaska are our only representatives of this groui). 



Group V. — Hylastes. 



In this group a reversion is made towards Cossonidas, and some 

 tribes of Curculionidse, in the antennal funicle and club, the ex- 

 cavated prosternum, and the antennal grooves of the beak, wiiich, 

 though short and stout, is more developed than in any other 

 Scolytidne. The tibiae are, however, more strongly serrate, and 

 are armed with a strong apical spur; the tarsi are rather short, 

 and the third joint is more or less dilated, bilobed, or emarginate. 

 The ventral sutures are straight and deep; first and fifth segments 

 longer than the others. The licad is exserted and prominent, the 

 beak short and stout, with obrK[Uc deep grooves, which unite in 

 the gular space, forming a transverse impression; the eyes are 

 transverse, not very finely granulated. Antennae with 7-jointed 

 funicle and oval annulated club, which is not compressed, and 

 has the basal joint large, corneous, and shining, very much as 

 in Baris. The scutollum is small, not depressed, and the basal 



