28 Natural History Bulletin. 



prothorax and elytra, as in B. virginice., but the humeri are 

 acutely pointed, the pubescence is coarser and not so dense. 

 Length, 1.8 mm. Plate X., Fig. 93a. Plate XII., Fig. 137. 



9 head wider than long, eyes small, vertex elevated above 

 the eyes, laterally carinate, flat above, occipital foveae large, 

 pubescent, mutually twice as distant as either from the eye; 

 circumambient sulcus feeble, enclosed surface, and that 

 behind the sulcus convex; occiput carinate; supra-antennal 

 elevation punctured, frontal margin depressed and emargi- 

 nate in the middle, the lateral, pendant, lobes setose; from 

 th^ lower part of the emargination emerge two small shin- 

 ing teeth, below which, and separated by the interantennal 

 excavation on the clypeus, rises an elongated tubercle bearing 

 two tufts of hair; the sides of the clypeus are reflexed, sur- 

 face below the tubercle conical, with a triangular depression 

 each side near the tubercle; labrum constricted at the base. 

 AntenncB with the basal joint triangular, carinate above, emar- 

 ginate at the tip, the triangular pendant lobe rounded at the 

 free angle; second joint two-thirds as long as the first, ob- 

 conical, third shorter nearly quadrate; fourth to seventh equal, 

 eighth shorter, ninth transverse, sHghtly cuneate internally; 

 tenth large, globular; eleventh as thick as the tenth, and as 

 long as the ninth and tenth together, rounded at the base, 

 conical, acutely pointed at the ends. Abdomen with two short 

 carinte at the base, mutually more distant than in B.-virginicB; 

 thighs thicker, tarsi very slender, claws simple. 



$ antenna regular, clypeus not separated from the simple 

 frontal margin, obsoletely carinate in the middle; anterior 

 margin finely retuse, entire, surface strongly punctured. 



Habitat. V'irginia; Iowa. 



B. TRiANGULiFER, Brciid. Shining black, densely pubes- 

 cent. Elytra, marginal rounded angle of .the prothorax, and 

 supra-antennal tubercle, in sunlight blood-red, antennee, palpi 

 and legs rust-red. Length, 2. mm. Plate X., Figs. 91 and 

 93b. Plate XII., Fig. 133. 



Head quadrate, vertex smooth, but slightly convex, with an 



