NEW NORTH AMERICAN PSELAPHID,E. 479 



slightly longer than wide, cylindrical, second shorter, slightly narrower, 

 nearly globular, three to eight narrower, transverse, the latter twice as wide 

 as long, ninth and tenth slightly more than twice as long, much longer than 

 the eighth, nearly rectangular, the tenth very slightly the wider and longer, 

 eleventh scarcely visibly wider than the tenth, very elongate and slender, 

 gradually acuminate and as long as the five preceding joints combined. 

 Prothorax but very slightly wider than the head, widest in the middle; 

 sides near the basal angles just visibly sinuate, in the middle strongly 

 rounded, near the apex very feebly sinuate; base broadly arcuate, two-thirds 

 as wide as the disk, one-half wider than the apex; disk as wide as long, 

 moderately convex, covered not very densely with small tubercles; median 

 canaliculation rather fine, equal, terminating near the base and apex; lateral 

 fovete small, deeply impressed, spongiose, at a little more than one-fourth 

 the length from the base, connecting groove transverse, straight, very fine. 

 Elytra slightly longer than the prothorax, at apex one-half wider than the 

 latter, distinctly wider than long; humeri not at all prominent; together 

 transversely truncate behind; disk feebly convex, rather sparsely and more 

 coarsely tuberculate, each with three basal foveae and four striae, one evenly 

 and feebly arcuate, two and three feeble, nearly equal, one-half as long as 

 the elytra, four stronger, one-third as long as the elytra. Abdomen very 

 slightly wider and longer than the elytra; sides arcuate; border rather strong, 

 inclined; surface rather strongly convex, scarcely visibly tuberculate, Legs 

 rather slender. Length 1.0 mm. 



California (Alameda 4). 



The sexual differences are apparently very feeble, the 

 terminal segment in the male being feebly impressed. The 

 mesosternum is bicarinate. 



0R0PUS Casey. 



0. montanUS n. sp. — Form slender, rather depressed, uniform dark 

 rufo-testaceous throughout; integuments polished, not perceptibly punctate; 

 pubescence fine, rather long, not dense. Head triangular, shorter and nar- 

 rower than the prothorax; eyes rather small, not very prominent, at slightly 

 more than their own length from the base; genee strongly convergent, feebly 

 arcuate; base broadly sinuate; base of occiput longitudinally impressed in 

 the middle; occipital foveas deep, distant, on a line through the posterior 

 limits of the eyes, connected by a narrow, deeply impressed, arcuate groove, 

 much shorter than wide; antennae short, robust, distinctly shorter than the 

 head and prothorax together, club elongate, rather feeble, joints three to 

 eight transverse, the former slightly wider than long, the latter more than 

 twice as wide as long, ninth and tenth joints twice as wide as long, nearly 

 rectangular, tenth just visibly wider and longer thau the ninth, eleventh 



