8 NATURAL History BULLETIN. 
61 Head very flat, vertex slightly carinate, frontal margin triangular, 
declining to the clypeus and but slightly separated from it by a linear 
sulcus. 
Prothorax with conspicuous discal crests and deep grooves, giving 
the disk the appearance of having five lines; occipital foveze 
pubescent. Length 2.2mm. Pennsylvania, Iowa. 
lineaticollis. 20 
Prothorax without discal crests and median sulcus; vertex 
smoother in the middle. Virginia, Pennsylvania. Jdistriatus. 2% 
52 Vertex smooth, not carinate, front, behind the very retuse (4) margin, 
deeply excavated; ¢ front declivous, not retuse; occipital foveze pubes- 
cent, antennz alike in the sexes. 
' Vertex, sulcus deep; prothorax without crests or spines; shoulders 
high, prominent, rounded. Totally impunctate, elytral basal 
fovez two, the intermediate wanting. Length 2.2mm. _ Illi- 
nois. - - - - - - - - - frontalis, 2% 
Vertex finely scabrous outside of the shallow circumambient sul- 
cus; prothorax with four basal spines. Length 1.9 mm. 
Michigan, Iowa. - - - - - - simplex, %3 
5! Vertex high, roof-shaped, smooth, carinate throughout, fovee nude, 
border broad, flat, very densely punctured; tenth antennal joint (4) 
hs gies globose, larger than the last, shoulders spinous. Length 1.7 mm. 
x. species Pennsylvania, Illinois, Iowa. - - - - - - globosus, a3 
41 Frontal margin not produced beyond the inter-antennal line, perpendicu- 
larly declivous above the sub-frontal excavation; tenth antennal joint 
(é) very large. 

72 Occipital fovee nude, shoulders blunt, rounded, head orthognathous. 
Reddish-brown, median prothoracic sulcus nearly entire; ¢ tenth 
antennal joint large, globose, with a small perforate fovea at 
the base. Length2.1mm. Virginia. - - vwirginia, 2& 
Black, antennz and legs red, median sulcus entire, obsolete. ¢ 
tenth antennal joint large, globose, foveate beneath. Length 
1.6mm. Virginia. (B. luculentus, Casey.) - spretus. 2@ 
Var. a.; median sulcus of the pronotum indicated; fovea of the 
tenth antennal joint very large - - -  fovetcornis. 24 
Var. b.; median sulcus short, more distinctly visible; tenth anten- 
nal joint very little larger than the ninth; last joint larger 
than usual. - - - - - . - punctifrons. 27 
71 Occipital fovez pubescent, shoulders spinous. 
Reddish-brown or black, with red elytra, antenne and legs; vertex 
feebly earinate behind; ¢ antenne with the basal joint bluntly 
toothed below, the tenth large, globose, with a small perforate 
puncture at the base below. Length 2.1 mm. Virginia, 
Toway 20s a 5 ie ihe alga oe ha ae 
