294 COLEOPTERA OF NORTH AMERICA. 



Eyes large, coarsely granulated, not hairy. CKIOCEPHALUS. 



Eyes divided, rather finely granulated. 



To Nothorhina belongs Asemum asperum Lee., from Oregon 

 and Vancouver. From Asemum must be excluded A. australe 

 Lee., which is an anomalous Criocephalus, differing from all the 

 others by the eyes being deeply emarginate. 



Group II. Opsimi. 



Opsimus quadrilineatus Mann., from Alaska and Oregon, con- 

 stitutes this group ; it is a lead- colored, finely pubescent insect, 

 having the prothorax armed with a lateral acute spine, and the 

 disk of the elytra with several vague impressions. The antennae 

 are punctured and coarsely pubescent, as long as the body ; the 

 head is short and perpendicular in front ; the eyes narrow, emar- 

 ginate so deeply as to be completely divided, not finely granu- 

 lated ; the palpi are unequal, the labial short, the maxillary 

 elongate, last joint triangular, obliquely rounded at tip ; the front 

 coxae are large, globose, and contiguous, scarcely angulated 

 externally, the lateral fissure being only narrowly open ; the 

 middle coxal cavities are angulated externally, but the sternal 

 pieces come in contact so as to cut off the episterna; the episterna 

 of the metathorax are wide in front, narrowed and pointed 

 behind ; the legs are stout, the thighs strongly clavate, the spurs 

 small, and the 1st joint of hind tarsi longer than the two follow- 

 ing united. 



The singular character which distinguishes this from all other 

 groups is, that the thickened hind margin of the prothorax is 

 broadly emarginate in the arc of a circle, and the emargination 

 filled with a thin corneous plate. The mesonotum is punctured 

 each side, with a very broad and flat, extremely fine, stridulating 

 surface. 



Group III. Smodici. 



Smodicum cucujiforme (Say), a small narrow depressed pale- 

 yellow species, found under bark in the Atlantic States, constitutes 

 by itself a distinct group, characterised by the mesothoracic 

 epimera being narrowed and acutely pointed inwards ; the middle 

 coxal cavities are widely open externally. 



The front is broad, short, and perpendicular, the eyes coarsely 

 granulated, very deeply emarginated ; the mandibles small, 



