The Pselaphid^ of North America. ii 



B. FEROX, Lee, Reddigh brown, rather densely pubescent, 

 punctulate. Length, 2.4 mm. Plate X., Fig. 78. 



^eff(i transversely quadrate; posterior angles broadl}' arcu- 

 ate, convergent; base elevated in an equilateral triangle 

 limited by two anteriorly convergent carince, and with a third 

 carina in the middle; foveas small, in a line through the pos- 

 terior third, laterally anterior to the elevated triangle; the 

 vertex is declivous, anteriorly smooth, pohshed, the excavation 

 limited by the nearly straight frontal margin. The sulcus 

 originating in the occipital fovea is faint; the lateral margin 

 is punctured; the frontal tubercles acute, dentiform, roofing 

 the antennal cavity. The middle of the frontal margin is 

 minutely carinite longitudinally. Eyes of the 3 moderately 

 large, not prominent, rounded. Antennce. half the length of 

 the body; first joint cylindrical, emarginate above for the 

 articulation of the second joint which is slightly narrower, 

 oblong-obconical; joints three to nine gradually cylindrical, 

 then quadrate, rounded, and slightl}' decreasing in width; 

 tenth larger, globose in the 3, obconical in the ?; the last joint 

 is as long as the two preceding, thicker, oblique, truncate, 

 rounded at the base. Palfi dark brown, the last joint cylin- 

 drico-fusiform, lighter at the tip which is bent inward, and as 

 long as the first antennal joint. Proihorax widest at the ante- 

 rior third, where the width equals that of the head; sides 

 strongl}' arcuate, somewhat sinuate behind the middle; base 

 two-thirds of the greatest width; neck half as wide as the 

 base. The length is shghtly less than the width; the disk 

 very convex; median sulcus fine, obsolete in the anterior 

 fourth; lateral carinae spinous, basal foveas deep, nude, lateral 

 ones irregular. The lateral sulci are slightly impressed, 

 parallel to the sides, basal tubercles acute. Elytra convex, 

 one-sixth wider across the shoulders than the thorax; 

 sides very divergent; the greatest width is across the tips, 

 where it is nearly one-half greater than at the shoulders. 

 The length of the suture in the female is shghtly 

 greater than the width at the shoulders; in the male it is still 



