178 CALIFORNIA ACADEMY OF SCIENCES. 



long, tenth scarcely as long as the ninth, strongly transverse, obliquely trun- 

 cate throughout its width at apex, eleventh as long as the three preceding 

 together, very slightly wider than the tenth, ovoidal at base, much more con- 

 vex exteriorly than within, obliquely attenuate and obtusely pointed. Pro- 

 thorax widest at two -fifths its length from the aj)ex, where it is fully as long 

 as wide, as wide as the head; sides very strongly rounded, thence convergent 

 and rather strongly incurvate to the base which is transversely, very feebly 

 arcuate, but slightly more than two-thirds as wide as the disk, one-third 

 wider than the apex; disk strongly convex, very fiaely, feebly and sparsely 

 punctate; median fovea rather large, rounded, very deep; lateral smaller, 

 continued anteriorly by parallel, arcuate, broadly impressed grooves, con- 

 nected with the median by anteriorly arcuate and scarcely visible grooves 

 just before the basal tuberculations, which are but slightly elevated, more 

 abrupt anteriorly than posteriorly; lateral basal foveae rather distant from the 

 basal margin; median carina strong. Elytra at base very slightly wider than 

 the base of the pronotum, nearly as long as wide, strongly, evenlj^ convexj 

 very minutely, feebly and sparsely punctate; sutural striae fioe, deeply im- 

 pressed; discal broadly impressed, short, feeble. Abdomen shorter and very 

 slightly narrower than the elytra, convex, extremely minutely, sparsely 

 j)unctate; first segment with two short, approximate, parallel carinae at base. 

 Legs long, somewhat robust; posterior tibise distinctly bent; tarsi much 

 paler in color. Length 2.2 mm. 



California; (El Dorado Co., !)■ 



The male has at the apex of the venter, a large, very ab- 

 rubt, deeply impressed fovea, slightly wider than deep, the 

 anterior edge of which is almost entire and transversely 

 truncate. 



This species can easily be distinguished from any other 

 here noted by its intense blackness, shorter antennae, ab- 

 sence of median pronotal groove, and form of the sexual 

 fovea. 



The species thus far described have two basal carinas on 

 the first visible dorsal segment of the abdomen; the follow- 

 ing has no basal carinse, and the elytra are much shorter. 



B. OCCiduus n. sp. —Rather slender, strongly convex; body very uniform 

 in color throughout, dark brownish-rufous; legs slightly paler, rufous; an- 

 tennae fuscous, very slightly paler at tip; integuments very highly polished; 

 pubescence coarse, pale, very sparse. Head moderate, as wide as long; eyes 

 small, prominent; sides behind them very strongly convergent, strongly 

 arcuate to the neck, which is transversely truncate, two-fifths as wide as the 



