The Pselaphid.-e of North America. 281 



impressed. Second segment prolonged in the form of a tra- 

 pezium, sides slightly emarginate, tip transverse, half as wide 

 as the base, which is deeply concave, a dark cavity visible in 

 the emargination of the first segment. Surface of the pos- 

 terior segments perpendicular. 

 Habitat. Maryland, Virginia. 



B. iLLiNOiENSis, Brcndcl. Dark piceous, elytra red-brown, 

 antennse piceous-brown, legs and palpi dull brownish-yellow, 

 faintly punctate. Length, 1.7 mm. Plate VIII., Fig. 55. 



Head with the occipital foveas rather large, very near to the 

 eye, frontal margin arcuate in the middle. Antennce less than 

 one-half as long as the body, first joint large, cylindrical; 

 second smaller, rounded, third to eighth still smaller than the 

 second, equal in thickness, subequal in length; eighth sub- 

 globular, ninth obconical, longer, tenth twice as wide as the 

 eighth, trapezoidal, the eleventh oblong-ovoid, twice as thick 

 as the ninth. Prothorax punctulate, visibly wider than long, 

 the greatest width being attained at the middle, where it 

 ex'ceeds that of the head, convex, the lateral fovece in nearly 

 full view from above. Elytra punctulate, one-third longer 

 than the prothorax, the width at the shoulders equal to the 

 sutural length. Across the tip they are one-fifth broader. 

 Shoulders moderately prominent, sutural and discal lines 

 parallel, the latter deep near the base, convergent behind the 

 middle, and abbreviated one-fifth from the tip. Abdomoi with 

 the first dorsal one-third as long as wide, the carinas including 

 more than one-third of the segmental width, and extending 

 along one-fourth of the length. 5 first dorsal produced behind 

 into two acutely-pointed triangular lobes, depressed laterally 

 from the apex to the basal marginal angle. Between the two 

 cusps is a declining, posteriorly depressed, nearly level sur- 

 face. Second segment arcuately produced, depressed at the 

 base, and with a large punctate median fovea. Legs slender, 

 the posterior tibiee with a long terminal spine, the intermediate 

 trochanters with a small sharp one. 



