The Pselaphid^e of North America. 297 



Head with the eyes near the base, tempora short, arcuate 

 to the nearly straight base, occipital fove^e in a line with the 

 anterior part of the eyes, large, twice their own width apart, 

 inter-antennal space transversely depressed and punctured, 

 containing a smaller rounded fovea, supra-antennal tubercles 

 large. Antennce shorter than the head and prothorax, first 

 and second joints subequal, conic-cylindrical, third to eighth 

 subequal in width, fourth and seventh quadrate, equal; third, 

 fifth and sixth longer than wide; ninth and tenth trapezoidal, 

 transverse, eleventh a little longer than wide, obliquely pointed. 

 Prothorax with the sides arcuate on the anterior third, con- 

 verging to the neck and slightly so towards the base, the 

 posterior part of the sides nearly straight. Base three-fourths 

 as wide as the disk, the latter convex, punctulate, median 

 fovea a small rounded puncture, lateral foveas pubescent, 

 small. Elytra near the tip nearly twice as wide as the pro- 

 thorax, the length being one-sixth less than the width; sutural 

 lines parallel, discal ones arcuate, sharp. Abdomen with the 

 basal carinte short, slightly divergent, including one-third of 

 the segmental width. Posterior tibiae clavate, arcuate, in the 

 male; the elytra are longer in the female, and the last ventral 

 simply flattened in the middle. 



Habitat. Western Nevada and the adjoining parts of 

 California. 



B. POLITA, Brendel. Grayish-brown or darker, highly 

 polished, impunctuate, pubescence inconspicuous, fine, sparse, 

 legs and antennae dark brown. Length, 1.2 mm. 



Head very slightly vaulted on the vertex, the disk as long 

 as wide, clypeus and mouth not very much protruding, eyes 

 small, not very prominent, tempora rounded longer than the 

 e3'es, occiput evenly convex the base-line straight. Fovese 

 equal, mutually three times as distant as either lateral one 

 from the eye. Anteniu^ robust, not longer than the head and 

 prothorax, the first two joints strong, sub-equal, sub-cylindrical. 

 Third narrower obconical, fourth small quadrate, fifth and 

 sixth a little thicker than the fourth, slightly longer than wide. 



