The Pselaphid^ of North America. 19 



diate trochanter with a slender spine; posterior tibia arcuate. 

 Habitat. Pennsylvania and Illinois. 



B. RiPARius, Anbe. Bright red, slender, strongly punctur- 

 ed, pubescent. Length 1.4 to 1.6 mm. Plate X., Fig. So. 

 Plate XII., Fig. 140. 



Head a little wider than long, finely scabrous; margin 

 broad, flat, produced in front, and minutely emarginate above 

 the insertion of the antennas; vertex vaulted, the crest not 

 more than indicated, the lateral fove^e small, deep and nude. 

 In the ? the front is declivous anterior to the interantennnal 

 line. AntenncB, $, half the length of the body the first joint 

 cylindrical; second to eighth gradually smaller and rounded; 

 ninth much larger than the eighth and irregularly transverse, 

 toothed outside; tenth larger, globose; the eleventh not as 

 thick, but more than twice as long, straight inside, convex 

 outside, with a large tooth inside of the base, which is turned 

 backwards. $, antennal joints regular, the last joint not as 

 long as the two preceding ones, regularly- acute-ovate, not 

 toothed. Prothorax little longer than broad, punctured ; the 

 impressed longitudinal lines fine, sharply cut; the basal fovea 

 small but conspicuous; the basal tubercle and the linear discal 

 crests not prominent but easily discernible. Elytra very con- 

 vex, punctured, longer than broad; shoulders blunt, discal 

 lines none, sutural line straight, the interval darker, sculptur- 

 ed. The abdominal dorsal basal impressions are deep, nearly 

 equal; elytra in the female less deeply punctured. Legs deep 

 orange, punctured; the spur of the posterior tibia is very long 

 in perfectly preserved specimens, but may be broken or 

 entirely lost in others. 



Habitat. Country along the Ohio river. 



B. SCABRICEPS, Lcc. Piccous, legs, antennae, and palpi 

 paler. Length 1.9 mm. Plate X., Fig. 86. Plate XII., Fig. 

 138. 



^£^rt^ scabrous, broader than long; vertex slightly convex, 

 carinate on the occiput, with the sulcus very faint, or indicated 



