322 G. n. HORN, M. D. 



that it difficult to say whether the impressions are caused by them 

 or by independent punctures. 



This species is represented in Leconte's cabinet by one specimen 

 under the name of Drasterius praeses, Cand., to which it cannot be 

 referred either generically on specifically. The coxal plates are very 

 feebly dilated internally and the front not margined, both characters 

 being at variance with Drasterius. 



One specimen from Bitter Root Valley, Montana. 



C. obversus, n. sp. — Black or piceous, feebly shining. Head cribrately punc- 

 tured. Antennae rufous, third joint longer than the fourth. Thorax longer 

 than broad, broader anteriorly than at base, convex ; median line moderately 

 impressed, entire; surface coarsely punctured more densely at the sides feebly 

 lounded, gradually narrowing to base, hind angles acute, feebly divergent and 

 carinate. Elytra as broad as thorax at base, elongate oval, humeri broadly 

 rounded; surface moderately convex, striate, intervals convex, punctulate and 

 reticulate. Body beneath as above, densely punctulate and clothed with red- 

 dish-yellow hairs. Legs rufous; Length .46 inch ; 11.5 ram. 



The color of the body is variable. In the two specimens before me 

 the elytra are nearly black, and in one (cabinet Ulke) the thorax is 

 dark brown nearly black and more shining, the other (my cabinet) 

 the thorax is reddish-brown and opaque. In both the legs are red, and 

 the under surface agrees in color with the corresponding portion of 

 the upper surface. It is allied to conjiuigcns, but is more convex in 

 all its parts and the thorax larger in comparison with the elytra, the 

 latter being more distinctly oval than any species in our fauna. The 

 surface is sparsely clothed with short reddish-yellow hairs of a decidu- 

 ous character. 



Two specimens from near the western base of the Sierra Nevada, of 

 California, 



C. nebraskensis, Bland, Proc. Ent. Soc. Phil. I, 355.==C. triundulatus. 

 E.and. 



The typical specimen described as above cited has been carefully ex- 

 amined with the result indicated. The elytra are described as reddish 

 yellow which is true, but there are faint traces of the three undulated 

 bands, enough however to indicate their position which corresponds 

 exactly with that seen in the more developed form. The specimen is 

 also scarcely matured and the legs are fuscous and the antennae paler 

 than in perfect specimens. In every other respect the type agrees 

 with the normal specimens of triundulatus, Hand., now before me. 



C. nigricollis, Bland, Proc. Ent. Soc. Phil. Ill, fiS. 

 Belongs to the same group with the preceding, (Sec. V, Cand.) 



