The Pselaphid^ of North America. 239 



anteriorly and posteriorly. Base very little narrower than the 

 width of the disk; one-fourth from it are three small fovete, 

 the lateral oues on the declivity of the sides and connected 

 with the middle one by a fine, nearly straight sulcus. Elytra 

 one-third longer than the prothorax across the high, prominent 

 shoulders, twice as wide as the head behind the eyes and 

 twice as wide as the base of the prothorax across their tips; 

 lines and basal impressions deep, disk slightly more convex 

 than in T. humeraUs. Abdomen of the same form as in the 

 preceding species, the median basal tubercle elongate, visible. 

 Legs stout, intermediate trochanters bluntly spinose, anterior 

 tibiae rough near the middle. The last dorsal is truncate in 

 the male and pointed in the female. 



Habitat. Western slope of the Sierra Nevada, Montana. 

 (Wickham). 



T. ELONGATUS, Brcud. n. sp. Slender, brownish-red, 

 elytra and legs brighter, impunctate, pubescence long and 

 abundant. Length, 1.95 mm. Plate VI., Fig. 21. 



Head sessile, as long as its width behind the eyes, occiput 

 evenly transversely convex, base sharply edged. Tempora as 

 large as the eye, convergent, eyes large, supra -antennal 

 process rhomboidal, the upper surface declining to the median 

 sulcus, frontal fovea large, interocular fovea? small, deep, 

 obliquely elongate. Antenna' longer than the head and pro- 

 thorax; joints one to three longer than wide, subcylindrical, 

 decreasing in size, four to eight transversely oval, half as 

 wide as the first and little narrower than the third. The ninth 

 and tenth are trapezoidal, the base of the former being equal 

 in width to that of the second; the eleventh is as long as the 

 ninth and tenth together, ovate, the truncate base half as wide 

 again as that of the ninth. Palpi dirty yellow, second joint 

 sigmoid, clubbed, as long as the last, third rounded, quadrate; 

 the last is fusiform, nearly four times as long as wide and 

 furnished with a terminal seta. Prothorax widest in the 

 anterior third, length and breadth nearly equal, sides straight 

 from middle to base and more convergent than in T. hnmer- 



