The Pselaphid^ of North America. 49 



one-fifth wider than the head with the eyes included; the sides 

 are strongly arcuate, slightly sinuate anteriorly tow^ard the 

 neck, strongly sinuate posteriorly to the base and crenate; the 

 base is twice as broad as the neck; the disk broadly convex, 

 polished, indefinitely and imperceptibly punctulate; near the 

 anterior margin is a comma-shaped longitudinal fovea with its 

 attenuated end not reaching one-third of the pronotal length; 

 one-third the length from the base is a deeply impressed, 

 slightly arcuate groove, connecting the lateral, pubescent, 

 rather irregularly shaped foveas with the triangular median 

 impression; the slightly elevated space between the transverse 

 sulcus and the thinly elevated basal margin has on each side 

 of the middle a small rounded impression (or perhaps a tuber- 

 cle), and, near the basal angle, a deep puncture. Elytra as 

 wide across the rather prominent shoulders as the prothorax, 

 the sides evenly arcuately divergent; the length of the suture 

 is equal to the width of the shoulders, the sutural Hnes are 

 nearly parallel, fine, and close, the lateral one-half of the elytral 

 length, fairly conspicuous; the base of the elytra is slightly 

 elevated, the basal impression transversely dilated. Abdomen 

 short and broad, sides of the three upper segments parallel, 

 the four segments sub-equal in length; the base of the first 

 segment has three transverse depressions, of which the mid- 

 dle one is twice as wide as the lateral one. Legs slender, 

 weak. The sexual differences are not very prominent, con- 

 sisting of the rounded form (£) of the last ventral which is 

 broader than in the ?, and the transverse impression on the 

 penultimate ventral segment. 

 Habitat. Mississippi Valley. 



T. LATicoLLE, Casev. Variety of the preceding; darker 

 in color, nearly piceous-black, the elytra in some reddish, in 

 others greenish brown, legs and antennae paler. The 

 prothorax is more stronglv sinuate at the sides near the base 

 and the median oblong fovea is shorter, being in some a mere 

 comma-shaped puncture. 



Habitat. Louisiana. Iowa. 



