18 NatTurAL History BuLueEtTIN. 
antennal joint with a short basal tooth; last ventral with a 
shallow transverse oval impression. 
Habitat. Humboldt county, California. 
B. scHaumu, Aubé. Piceous black, coarsely punctate, pubes- 
cence long; antenne and legs paler than the body; palpi red. — 
Liength’2:t'mm. ' ‘Plate X, Fig; ér. Plate XiD Migs rs6, 
fflead as wide as the prothorax, smooth on the vaulted 
vertex, without carina, two deep nude fovez 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. Antenne 
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; ¢ with 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. Addomen less strongly punctured, 
the marginal basal triangle very broad, basal carinz conspicu- 
ous, lateral depression wide and deep; the fourth dorsal 
segment longer than the third. Legs punctured. 4, interme- 
