288 NaTuRAL History BULLETIN. 
ity, where it is distinctly punctured; sutural lines convergent 
from behind the middle to a spinous sharp point on each 
elytron; discal lines strictly parallel and but slightly converg- 
ent near the tip; basal fovea small and near the base. Addo- 
men not punctured, first segment not longer than one-fourth 
its width, striz very short, one-sixth of the length of the 
segment, very divergent, and not further apart than the elytral 
sutural lines; last ventral punctured. @ last ventral inside of 
a nearly circular space, rather flattened, but not impressed. 
Length, 1.4 mm. 
There are varieties in color and the strength of the punc- 
tuation of the prothorax and elytra. 
This seems to be the most common species in Iowa. It 
differs from congener and rubdicunda by the punctation of the 
prothorax, the two latter species being impunctate, and in the 
abdominal striz, which are farther apart in those two species. 
Congener is much smaller, leather-colored, and does not occur 
in the West. 
B. pIvERGENs, Lec. Impunctate, piceous, antenne, palpi 
and legs yellowish-red, pubescence short, sparse. Length, 
c.3°mm. 
Head, including the prominent eyes, nearly as wide as the 
prothorax, the foveee of equal size and alike in form. Auten- 
ne with the first and second joints larger, the first as thick as 
the tenth; second as wide as the ninth and as long as the 
third; third to sixth cylindrical, half as wide as the first, 
seventh and eighth gradually shorter, eighth as long as wide; 
eighth, ninth and tenth regularly increasing in length and 
width, each one as long as wide, the eleventh twice as much 
so, ovoid-acuminate. Prothorax transversely convex, a little 
wider than long, the lateral fovez circular, not in full view 
from above; median puncture oblong. /ytra moderately 
convex, very minutely and confusedly punctured, disk near 
the tip more than half as wide again as at the humeri, shoul- 
ders tumefied but not laterally prominent, the lines sharp, not 
deep, the discal ones arcuate, approaching the suture and 
