AMERICAN COLEOPTERA. 329 



of middle and moderately arcuate to apex, finely striate, strise punctured, in- 

 tervals flat, finely transversely strigose and punctulate, clothed with whitish 

 pubescence; color pale testaceous, more rarely slightly ferruginous, humeri 

 always with dark spot, sides rarely infuscated. Pygidium elongate oval, ob- 

 lique, moderately convex, coarsely punctured, clothed with whitish pubes- 

 cence, near apex becoming dusky or variegated at base, and on each side near 

 apex a smooth, impressed, elongate space. Body beneath pale testaceous, 

 pectus and sides of abdomen dusky, punctulate and clothed with whitish pu- 

 bescence. Legs pale testaceous, extreme tips of tibiae and terminal tarsal joint 

 piceous. Length .OS inch; 2 mm. 



The above description applies to the large majority of the specimens, 

 in which the thorax and elytra are darker in color the pubescence is 

 variegated. On the thorax the pubescence is in great part sparse but 

 along the median line behind and a small space on each side of the 

 lobe, the pubescence is more dense. On the elytra also the pubes- 

 cence of the striae is transversely interrupted at irregular intervals. 



This species resembles a diminutive B. prosopis, Lee, but the latter 

 has the strong tooth and two denticles well defined. 



Occurs in the seed of the Screw-bean, Strombocarpm pubescens, in 

 Arizona. 



B. aureolus, n. sp, — Oblong oval, black, densely clothed with yellowish- 

 white lustrous pubescence. Head black, densely punctured, scarcely pubes- 

 cent. Antennae black, not as long as head and thorax. Thorax similar to the 

 preceding speeies, coarsely punctured aud rugulose, densely pubescent. Scu- 

 telluni oblong, clothed with paler pubescence. Elytra similar in form to the 

 preceding speeies, piceous or nearly black, densely clothed with yellowish- 

 white lustrous pubescence, surface striate, strise punctured, intervals flat, 

 densely rugoso-punctate. Pygidium oval, oblique, moderately convex, densely 

 punctured, clothed with yellowish-white pubescence with pale median line 

 widest at base. Body beneath black, densely punctulate, more sparsely clothed 

 with a whitish pubescence. Legs entirely black. Length .08 — .10 inch ; 

 2 — 2.5 mm. 



The tooth of the hind femur of this species is small but acuta at 

 tip, the denticle scarcely perceptible, distant from the tooth. Resem- 

 bles the preceding species in form, but differs in the color and vesti- 

 ture, and like it has its larger analogue in the following group. 



Occurs in the desert region of California. The food plant is 

 unknown. 



B. pauperculus, Lee, Pacif. R. R. Report, App. i., p. 52. — Oblong oval, 

 black, moderately shining, sparsely cinereo-pubescent. Head densely punc- 

 tured, opaque. Antenna? longer than head and thorax, black, three basal joints 

 piceous. Thorax nearly twice as wide at base as long, sides strongly arcuate in 

 front, slightly sinuate near the hind angles, base slightly lobed at middle, lobe 

 truncate, on each side nea;ly straight, surface coarsely punctured, intervals ru- 

 gulose, sparsely cinereo-pubescent, inclining to brownish. Scutellum slightly 



