22 Natural History Bulletin. 



Legs long, robust, the tibiae longitudinally carinate, the thighs 

 below longitudinally sulcate. 



Varies in the punctuation, being sometimes very faint. 



Habitat. Pennsylvania. 



B. bistriatus, Lee. Dark red-brown or dark piceous, pol- 

 ished; legs and antennge dark red. Length, 2.1 mm. 



Head flat, as long as wide, not convex above, occiput slight- 

 ly carinate, occipital foveas small, the connecting sulcus shal- 

 low, the enclosed space smooth, the excluded margin broad, 

 scabrous; the frontal margin is triangularly produced and con- 

 tinuous with the clypeus; eyes prominent, conical. Antemice 

 as long as the head and prothorax together, third to eighth 

 joints equal, quadrate, ninth and tenth obconical, gradually 

 larger, the last ovate, acuminate. Prothorax punctulate, the 

 median sulcus obsolete, no carinee. Elytra., angulate at the 

 shoulders, convex, punctured. Legs long, 5 with a spur at 

 the end of the intermediate tibia. 



Habitat. Pennsylvania. 



B. frontalis, Lee. Brownish-red thinly pubescent, im- 

 punctate. Length, 2.4 mm. Plate X., Fig. 88. Plate XII., 



Fig. 134- 



Head of 5, from the apex of the triangularly produced frontal 

 margin to the base, as long as the width of the head including 

 the eyes; in the $ it is shorter and the frontal margin is 

 straight between the antennae. Two small foveee between the 

 eyes are connected by a sulcus running along the margin; 

 vertex and occiput elevated behind, depressed toward the 

 frontal margin; face, below the overhanging front, with a 

 horizontal spine, and two acute tubercles on the carinated clyp- 

 eus; antennal foveae small. Palpi yellow, third joint trian- 

 gular. Prothorax., length and width equal, broadest before 

 the middle, tri-sulcate near the base; at the posterior end of 

 the groove are three foveee, between which are two blunt 

 pointed tubercles; disk smooth, not carinate. Elytra and ab- 

 domen not perceptibly punctured, thinly pubescent, the former, 



