352 REVISION OF THE TENKBKION lli.V. OF AMERICA, 



Base of thorax strongly sinuate. 



Elytra very sparsely pubescent. di hit at us. 



Thorax broader in front of middle. br e vicollis . 



Thorax gradually narrowing from base. lecontei. 



pratensis. 

 Elytra densely clothed with cinereous pubescence, vestitus. 

 Base of thorax nearly truncate. 



Sides of thorax evenly rounded, not narrowing in front. 1 o n gulu s . 

 Elytra either glabrous or with a few black hairs. 



1 lead, thorax and legs ferruginous. discolor. 



Body entirely black. 



Base of thorax strongly sinuous, hind angles more pro- 

 longed than the middle of the base. m oe s t us . 

 Base of thorax less sinuate, hind angles less prolonged 



and less acute. p u 1 verulen tus. 



Elytra glabrous, aeneous or aeneous black; striae interrupted. 



Thorax densely and coarsely punctured, less shining. i n t e r r uptus. 



Thorax sparsely punctured, shining ; elytra aeneous. metallic us. 



B. sordidus, Lee, Ann. Lye. V., 146. 



This species is easily distinguishable by the flattening of the upper surface of the 

 thorax along the lateral margin, and by the alternate intervals of the elytra being more 

 convex than the others. The thorax is broader than long, moderately rounded on the 

 --ides which converge toward the front; rather deeply emarginate anteriorly, with acute 

 angles. The base is broadly lobed at middle with the hind angles rather prominent 

 backwards, and is always closely applied against the base of the elytra. The front is al- 

 ways deeply emarginate, exposing (when recent) the basal membrane of the labrum. The 

 elytra are striate, the stria- closely punctured. The whole surface is clothed rather 

 densely with coarse, scale-like, recumbent ochreous hairs. The color of the surface is 

 brown. 



Length .32 inch. 



Very abundant under logs, at Camp Grant, Arizona. 



15. RlllcatuS, Lee, Ann. I. yc V., 117. 



Tin- margin is here also flattened, much less broadly however than in the preceding 

 species. The head and thorax are densel) and coarsely punctured. The latter is broader 

 than long, rounded on the sides, scarcely narrower in front, apex emarginate, angles dis- 

 tinct, base sinuate, less lobed at middle than aordidvs, and with less prominent hind 



