NORTH OF MEXICO. 



343 



what broader than long, feebly emarginate in bout and at base, sides feebly rounded and 

 slightly margined, anterior angles obtuse, bind angles nearly rectangular. The surface is 

 coarsely but not densely punctured. The elytra are elongate sub-parallel, moderately 

 convex, with eight entire and a short scutellar strise. The stria- are punctured, interstices 

 slightly convex and very feebly punctured. The legs are black and the under surface 

 nearly smooth. In addition to the generic characters given above, it may be stated that 

 the males have the under surface of the anterior femora near the base clothed with rather 

 coarse hairs. 



Rather common in the Atlantic region, under fallen logs or stones. 



C. opacus, Lee, Smithson. Cont. 4to, C<>1., Kansas tod New Mexico, p. 15. 



The entire surface is opaque in this species, while in the preceding the surface is shin- 

 ing and of a sub-metallic lustre. The elytra are not striate 1 , but have rows of fine, closely 

 placed punctures, the intervals being flat and impunoturcd. The general form is similar 

 to calcaratus, with the elytra, less parallel. The thorax is much less distinctly margined, 

 and the under surface less shining. The sexual characters are similar in both species. 



Length .67 inch. 



A single specimen from the Black Hills, Dacotah, is known. 



XYLOPINUS, Lee. 

 Xylopinus, Lee, Col. N. Am., 281. 



This genus differs from the preceding notably in the form of tire front. The anterior 

 margin is truncate or feebly emarginate, not thickened. The labrum is also more promi- 

 nent and is occasionally so protruded as to allow the basal membrane to become visible. 

 The males have the same sexual characters in the front tibiee as in Centronojpus. The 

 anterior femora have not the basal hairy spot, nor are the middle tibiae thickened at tip. 

 The front and middle tarsi are more distinctly dilated, and the whole appearance more 

 decidedly like the Helopidcs. All the specimens arc winged. 

 Our species may be distinguished as follows : 

 Body black, not metallic. 



Legs black. saperdoides. 



Legs red. rufipes. 



Body sub-metallic. a n escens. 



X. saperdoides, Oliv., (Tenebrio) Ent. 8, 11. saperdoides et calearatus, (IIolops) Boauv. Ins., 102, pi, 81, 

 fig. 2; spinipes, Fab., El. 1, 102; anthracinus, Kuooh, (Tenebrio) None. Beitrag., p. 109. 



The thorax of this species is nearly square, feebly emarginate in front, truncate behind, 

 sides very feebly rounded, anterior angles rounded, hind angles acute with a slight im- 

 pression within. The elytra arc elongate, parallel, feebly convex, usually somewhat flat- 



