The Pselaphid.-e of North America. 221 



Abdomen broader than the elytra, convex, polished, impunc- 

 tate, the first dorsal segment very large, longer than wide, 

 broadly margined, margin convolute at base, hairy, diminishing 

 in width posteriorly, basal fovea extending from the suture two- 

 fifths of the length of the segment. Two posterior dorsals 

 very short. Mesosternum arrow-shaped, anterior coxas cylin- 

 drical, contiguous, their trochanters arcuately conical, half as 

 long as the femora; intermediate cox£e small, rounded, pos- 

 terior transverse, femora angulate, the ridges setigerous, 

 grooved externally at the distal end for the reception of the 

 cylindrical, two-jointed tarsus. 



In the male the end of the middle trochanter has a curved 

 claw as long as that member. 



Habitat. Pennsylvania, Georgia, Illinois. 



A. LECONTEi, Brend. Honey yellow, pubescence in regu- 

 lar rows. Length, 2.5 mm. Plate VI., Figs, i and 2. 



Hcad\.\\\zit as long as broad, broadest along the inter-antennal 

 line, base only two-thirds of that width. Frontal margin and 

 sides straight as seen from above; vertex with two entire, 

 shallow, longitudinal impressions. Last antennal joint slightly 

 arcuate, otherwise of the same form as in A, ccecus. Protho- 

 rax bell-shaped, a little longer than the head, base twice as wide 

 as the neck, sides slightly arcuate, disk transversely convex, 

 with a transverse sulcus one-fifth from the base, which is inter- 

 rupted in the middle by an oval tubercle. Space between 

 the sulcus and the base ring shaped, convex, with a flat, cir- 

 cular plane in the middle bearing a center-point. Elytra as 

 in A. cams. Basal abdominal segment wider than the elytra, 

 margin arcuate and convolute near the base, thence divergent 

 in a nearly straight line to the posterior Hmit of the segment. 

 Disk trapeziform, convex, fove^ similar in form to those of 

 A. ccecus, which it also resembles in the sexual characters. 



Habitat. Mississippi Valley. 



