The Pselaphid.^ of North America. 233 



wide as the head and eyes, divided by a sharp cut running 

 backward to the inter-ocular Hne. Immediately behind the 

 tubercles the head is constricted to less than two-thirds of the 

 width of the frontal margin, and thence the sides diverge to 

 the eyes. Between the eyes are two large pubescent fovece, 

 and on the occiput at the base a small obsolete tubercle. An- 

 tcnnce moniliform, except the first joint, which is cylindrical, 

 nearly twice as long as thick. The second and third are 

 longer than wide, joints four to eight shorter, equal in length, 

 subequal in thickness, the fourth very slightly transverse; the 

 ninth and tenth are very little larger, equal, globular; eleventh 

 slightly longer than thick. Prothorax uniformly convex, 

 slightly transverse, widest one-third of the length from the 

 base, which is nearly twice as wide as the neck and as wide 

 as the length, or four-fifths the greatest width. One-sixth 

 from the base are three sharply impressed foveas, the lateral 

 ones partly hidden from above. Elytra across the shoulders 

 broader than the prothorax, and nearly as wide as the suture 

 is long. The humeral width is about two-thirds that of the 

 tip. The sides are divergent from the shoulders and nearly 

 straight, disk not, or very little convex; lines entire, deeply 

 impressed, suture depressed, humeri forming a prominent 

 ridge. Abdomen rather convex, broadly margined, edge of 

 margin curved, segments uniformly vaulted from side to side; 

 first dorsal shorter than the second, ventrals subequal, dimin- 

 ishing slightly in length. Legs long and slender, femora 

 cylindrical, tibiae thicker toward the end, or, in the male, the 

 intermediate ones slightly bent inward at the lower third, and 

 the posterior very much dilated, tapering at the distal third to 

 the compressed tarsus. 



Habitat. Mountains of Virginia and Tennessee. 



Ch. (?) FORMiCARiUM, Cascy. {^Biotiis/orDiicarius, Cas.) 



Cinnamon red, faintly punctulate, polished, prothorax trans- 

 verse, wider than long. Length 2.8 mm. Plate VI., Fig. 14. 



