NORTH AMERICAN COLEOPTERA. 177 



as the disk and one-fourth wider than the apex; disk strongly convex, 

 scarcely punctate; basal fovea large, dee^Dly impressed, rounded; median 

 channel very feeble, evanescent near the fovea, extendiog scarcely beyond 

 the middle of the disk; lateral foveas moderate in size, not very deeply im- 

 pressed, extended aateriorly in the usual arcuate groove, and connected with 

 the median by a tine line: immediately behind the middle of the latter, 

 acutely, feebly elevated or subtuberculate; between the median fovea and 

 base a fine elevated carina; on each side, at the base, two small, deeply im- 

 pressed foveae. Elytra and abdomen nearly as in the preceding species; the 

 former finely and sparsely punctate, the first visible dorsal segment of the 

 latter with two small, short basal carina. Legs slender. Length 1.9 mm. 



California; (Alameda Co. 1). 



This species agrees in general structure of the head and 

 prothorax with the preceding species, but may be distin- 

 guished from both by its much darker color and structure 

 of the antennal club; from mendociuo it differs in its much 

 more elongate prothorax and longer basal carinae of the 

 first abdominal segment; from zephyriniis in its shorter 

 basal abdominal carin^:e and smaller size, and from both in 

 the much more feeble median channel of the pronotum. 

 The basal carina of the pronotum is common to all these 

 species. 



The above description is taken, unfortunately, from the 

 female, but the species is so distinct that there can be very 

 little doubt of its future identification, its small size, slen- 

 der form, dark color, narrow ninth and tenth antennal joints 

 and especially the very feeble median channel being its 

 distinctive characters. 



B. monticola ii- sp, — Rather robust, convex, intense black throughout; 

 legs very dark rufo-piceous; antennae fuscous, very slightly paler, rufous at 

 apex; integuments polished; pubescence coarse, pale, suberect, not very 

 dense. Head moderate, scarcely as widaas long; eyes moderate in size, very 

 convex, rather finely granulate, just behind the middle; sides behind them 

 very strongly convergent and feebly arcuate to the neck; surface feebly con- 

 vex, impunctate; occipital foveas longitudinally elongate, deeply impressed, 

 on a line through the posterior portion of the eyes, connected by a very 

 strongly arcuate impressed groove; antennal tuberculations large, very 

 coarsely and feebly punctate; antennae robust, scarcely longer than the head 

 and prothorax together, club rather robust; ninth joint slightly wider than 



