NORTH of Mexico. 353 



angles. The elytra are deeplj striate, the interstices flal and densely punctured. The sur- 

 face is clothed with a pubescence similar to aordidw, bul coarser and paler. The color of 

 the body is opaque brown. 



Length .23 inch. 



Found ;it Fort Yuma. California. 



B. a u r i p i 1 i s , elongate oval, opaque brown. Head 1 lerately, coarsely and densely punctured. Thorax con- 

 vex from the edge withoul depressed margin, broader than long, sides gradual!] converging and moderately rounded. 



A.pex emarginate, basal angles distinct, I >.c -f sinuate, lobed ;ii middle with angles pr inenl backwards, Biirfacc 



densely punctured. Elytra feebly striate, stria; punctured, interstices moderately convex and densely and finely punc- 

 tured. Upper surface of body moderately densely clothed with golden yellow scale-like haire, Beneath finel] and 

 densely punctured and clothed with similar l>ut finer pubescence. 



Length .30 inch. 



Easily known from the species which precede, l>y the absence of a depressed thoracic 

 margin, and from those which follow by the vestiture of the surface of the body. It is 

 the most convex of our species. 



Occurs at Camp Grant, Arizona, in company with sordidus, though less abundant. 



B. dilatatus, Lee, Ann. Lye. V.. 1 4i>. 



This species is usually black or deep brown in color, sub-opaque. The thorax is feebly 

 convex, slightly flattened behind the head, sides rounded, broader at middle than at base. 

 Apex moderately emarginate, base sinuate, angles not prominent. \ slight impression 

 on each side of base opposite the fourth elytra! interval. Surface coarsely and densely 

 punctured, punctures elongate and continent. Elytra feebl) convex, striate stria? coarsely 

 and closely punctured, intervals flat, finely but sparsely punctured; surface sparsely 

 clothed with brownish hairs. 



Length .:5(> inch. 



Occurs with sordidus, but is still mere abundant. 



15. brevicollis, Lee, Ann. Lye. V., 147. 



Similar in its characters to the preceding, differing in the shorter thorax, less rounded 

 on the sides, less coarsely and continently punctured. The form is slightly more elongate 

 and more convex. The vestiture and sculpture are similar to dilatatus. The legs paler. 



Length .26-.28 inch. 



Occurs rather abundantly near San Francisco. 



B. lecontei, MuK.. Opusc Entom. Cab.. 0, p. 128; I Ann. Lye. V., p. 117. 



Mure elongate and convex than the two species which precede. The thorax is less 

 rounded on the sides and not broader at middle than at base. The basal margin is less 

 strongly sinuate. The punctures of the thorax are finer, less dense and not elongate, and 



AMBBI. PB1LOSO. BOC. \ OL. \l v. —89 



