The Pselaphid^ of North America. 9 



Black, with reddish antennae and legs; vertex with a fine, entire 

 carina; S antennae with the basal joint spinous, triangular; 

 third joint in both sexes longer and stouter than the second or 

 fourth; tenth obconico-globular, large, not perforate. Length 

 2.0 mm. Long Island. (B. spiiiifer Brend. preoccupied.) 



triaugulifer. 



Black, with reddish antennae and legs; occiput carinate; *, basal 

 joint not modified; the third longer than the second or 

 fourth, very much tumefied on one side; tenth joint large, 

 globular, not perforate beneath. Length 2.0 mm. Georgia. 



nigricans. 



Black, with reddish antennae and legs; occiput carinate, vertex 

 with a central transverse puncture; basal antennal joints in 

 both sexes subequally decreasing in size; tenth long, globu- 

 lar, not perforate beneath. Length 2.0 mm. New York to 

 Illinois. cefhalotes. 



Posterior tibia without a terminal spur. Frontal margin 

 concave. 



B. lON^, Lcc. Reddish, polished, punctulate, pubescence 

 thin scattered, recumbent. Length, 2.66 mm. Plate X., Fig. 79. 



The head is longer than broad, occiput tumid, overlapping 

 the neck; vertex decHning from the occiput to the frontal 

 margin and separated from the lateral and frontal margins by 

 a slightly impressed circumambient sulcus. Eyes not promi- 

 nent. The last palpal joint is three times longer than ihick. 

 Prothorax bell-shaped, widest in the middle, but little nar- 

 rower at the base, with three longitudinal sulci of which the 

 middle one is nearly entire and ends near the base in a small 

 fovea. Between this fovea and each side of the median sulcus 

 is a small, acute tubercle; the sides of the prothorax outside 

 of the lateral sulci are depressed, and the space between the 

 lateral and median sulci is smooth, not carinate. Elytra 

 punctulate, pubescent, with low rounded shoulders; dorsal 

 lines abbreviated before the middle, more deeply impressed at 

 the base; sutural interval impressed. Abdomen very convex, 

 slightly depressed at the base, punctured, pubescent. Anten- 

 ncB not half as long as the body; joints tirst to eighth grad- 



