i8 Natural History Bulletin, 



antennal joint with a short basal tooth; last ventral with a' 

 shallow transverse oval impression. 



Habitat. Humboldt county, California. 



B. scHAUMii, Aube. Piceous black, coarsely punctate, pubes- 

 cence long; antennae and legs paler than the body; palpi red. 

 Length 2.1 mm. Plate X., Fig. Si. Plate XII., Fig. 136. 



Head as wide as the prothorax, smooth on the vaulted 

 vertex, without carinae, two deep nude foyeje between the 

 prominent eyes, and with a well impressed parabolic sulcus 

 separating the broad lateral border from the vertex; edge of 

 the lateral border carinate, and between it and the eyes is a 

 longitudinal carina; front concave, frontal tubercles prominent; 

 clypeus simple, continuous with the declining part of the con- 

 cave front and bearing in the middle a retuse tooth. Antemm 

 longer than the head and thorax together, robust, the three 

 basal joints thick, nearly quadrate, subequal; the three suc- 

 ceeding ones are oblong, rounded; seventh joint transverse, 

 eighth smallest, rounded; ninth and tenth obconical, gradually 

 larger, as long as wide; eleventh as long as the two preced- 

 ing, twice as wide as the ninth, acute-ovate; S wdth the last 

 joint bearing a strong tooth at the base, seventh with the 

 tooth outside. Prothorax as long or slightly longer than the 

 head, widest in the middle; median sulcus sharply cut near the 

 base, shallow anteriorly, evanescent before the middle ; median 

 fovea deep, limited behind by the acute end of a basal carina; 

 the lateral crests not interrupted, ending before the middle, 

 and limited near the base by a small acute tubercle: lateral 

 sulcus issuing from the lateral fovea, lost anteriorly in the 

 depressed border, and limited with the fovea behind by 

 another very acute tubercle, making in all five basal spines. 

 Elytra very coarsely punctured, widest behind the middle, the 

 sutural length equal to the elytral width, sides divergent, disk 

 very convex posteriorly. Abdo?nen less strongly punctured, 

 the marginal basal triangle very broad, basal carina conspicu- 

 ous, lateral depression wide and deep; the fourth dorsal 

 segment longer than the third. Legs punctured. 6, interme- 



