1879.| "Jl [Horn. 



impression limiting the anterior angles, and from Knochii by 

 its much more depressed form, coarser sculpture. The hind 

 angles are continuous with the lateral margin as in the two 

 species cited. The hairs of the upper surface, although few, 

 are a marked feature, but as they are probably deciduous as 

 in pUosicollis, too much value cannot be attached to them in 

 a specific point of view. 



Occurs in California or Utah, locality doubtful. 



C. Knochii Lee. 



Black, feebly shining. Head moderately densely punctured, front 

 slightly concave on each side, clypeus arcuate in front, side rounded, ante- 

 rior margin reflexed. Mentutn plate flat at bottom, sides and posterior 

 margin more widely reflexed. Thorax one-half wider than long, base not 

 wider than apex, sides broadly arcuate, anterior angles feebly prominent, 

 not limited behind by a line, and feebly pubescent within, posterior angles 

 triangular, smooth, distinctly limited within by an oblique impression, disc 

 of thorax usually moderately convex, at middle vaguely canaliculate, sur- 

 face with coarse but not densely placed punctures. Elytra moderately 

 convex, disc rarely depressed, surface with oval shallow fovea? not densely 

 placed. Pygidium sparsely punctate, Legs as in crinitus, tarsi as long as 

 the tibiae, slender and feebly compressed. Length, .36-.52 inch ; 9-18 mm. 



This species exhibits a slight range of variation in the 

 sculpture of the upper surface, the punctures at times being 

 coarser and more closely placed. This usually occurs in 

 those specimens with the disc of thorax and elytra flatter, 

 causing them to resemble the preceding species. The medi- 

 an line of the thorax is always more distinctly impressed. 

 In very fresh specimens the surface is sparsely clothed with 

 very short yellowish hair. 



The three preceding species form a small group among 

 those with entire mentum, by the legs being ambula- 

 torial, tarsi moderately long, the hind angles continuous 

 with the side margin of thorax, and not retracted. 



To this species should be referred the crenicollis of West- 

 wood. 



Occurs from Illinois westward to Utah. 



U. nitens Lee. 



Castaneous, moderately shining. Head coarsely and densety punctured, 

 vertex convex, clypeus arcuate, angles broadly rounded, margin moder- 

 ately reflexed. Mentum plate smooth and flat at bottom, sides and pos- 



