The Pselaphid^e of North America. 249 



T. COGNATUS, Lcc. Form more robust and convex than 

 in any other species known to us. Color, bright umber 

 brown, pubescence fine, body impunctate. Length, 1.25 mm. 

 Plate ViL, Fig. 29. 



Head with the eyes narrower than the prothorax, the usual 

 lateral punctures and triangular projection quite obsolete, the 

 frontal tubercles punctured. Antcnim longer than the head 

 and prothorax, first joint three times longer than wide, second 

 oval. Third to eighth globular, slightly decreasing in size, 

 the eighth slightly transverse, ninth to eleventh rapidly 

 increasing in size, ninth and tenth transverse, eleventh joint 

 oval, as long as the first and three times thicker. Palpi with 

 the first joint slender, cylindrical, sigmoid in the distal half, 

 clubbed; third half as long as the second, triangular, the free 

 angle rounded. Fourth half as wide as long equal in 

 length to the second, finely pubescent and with a terminal 

 seta. Prothorax very convex, one-third wider than the head, 

 widest in the middle where the sides are arcuate, and thence 

 straight toward the neck and base. Neck two-thirds as wide 

 as the base, disk with five basal punctures, the lateral fovese 

 large. Elytra as long as the head and prothorax, very con- 

 vex, sutural lines not parallel, curved, dorsal parallel to the 

 sutural ones and half as long. Abdomen shorter than the 

 elytra, segments equal in length. Legs slender. 



Habitat. Vancouver Island. 



T. TENELLUS, Lec. Black, polished, impunctate, elytra 

 black or red, antennae, legs and palpi, red. Length, 1.4 mm. 

 Plate VII., Fig. 30. 



Head as in P. pubcrulHS, no punctures. Antennce. with the 

 last three joints shorter, more rounded, obconical much more 

 transverse than in the preceding species. Last joint ovate, 

 acute, twice as thick as the tenth and scarcly longer, widest 

 behind the middle. Palpi with the second joint bent, 

 peduncle as long as the club, reaching backward to the 

 anterior border of the eye. Third joint only one-third as 



