308 CALIFORNIA ACADEMY OF SCIENCES. 



but not rounded; apex and base broadly, rather strongly and equally arcuate; 

 disk nearly one-third wider than long, moderately and evenly convex, rather 

 coarsely and closely punctate. Elytra at base about one-fourth wider than 

 the prothorax; sides very feebly divergent posteriorly and very feebly arcu- 

 ate; together very slightly wider than long, truncate posteriorly, feebly 

 sinuate at the suture and more strongly so near each exterior angle; disk 

 about one-fourth longer than the pronotuuo, feebly convex, very coarsely and 

 rather densely punctate; punctures somewhat asperate. Abdomen slightly 

 narrower than the elytra; sides parallel; border strong; basal segment very 

 coarsely and densely punctate, each segment being successively more feably 

 and sparsely punctate, sixth finely and very sparsely so; underside slightly 

 more finely punctate than the upper. Legs rather long, slender; first joint 

 of the posterior tarsi as long as the next three together. Length 2.9- 

 3.2 mm. 



California (Hoopa Val., Humboldt Co.) 



I found this very well-marked species to be gregarious 

 and exceedingly plentiful under the fungous bark of a de- 

 cayed log. The pubescence is fine, rather sparse, and not 

 conspicuous. The mesosternal carina is strong, and is a 

 posterior continuation of the reflexed apical margin. 



The type is described from the female; in the male the 

 third antennal joint is very much longer than the second. 



In this genus the head beneath has a very strong infra- 

 ocular ridge, proceeding from the outer posterior angle of 

 each maxillary fissure, to the posterior margin of the head, 

 feebly arcuate and gradually ascending. 



I, nigrinus n- sp. — Blackish-piceous; two basal joints of the antennae, a 

 small humeral spot extending nearly to the scutellum, and legs paler, piceo- 

 testaceous, the apices of the abdominal segments especially beneath are also 

 narrowly paler: pubescence very fine, recumbent, not very dense. Head 

 scarcely longer than wide; front moderately convex, very finely, feebly and 

 sparsely punctate; eyes moderate, having excessively fine, short and erect 

 setae; antennae slightly longer than the head and pronotum together, rather 

 slender, moderately incrassate; basal joint short, scarcely one-third longer 

 than the second, the latter about equal in length to tbe third, fourth very 

 slightly longer than wide, joints five to ten transverse, eleventh ovoidal, 

 acuminate, slightly shorter than the three preceding together; labrum more 

 than twice as wide as long, truncate, sides parallel. Prothorax widest 

 slightly before the middle where it is just visibly wider than the head and 

 scarcely one-fourth wider than long; sides rather strongly arcuate anteriorly, 

 feebly sinuate just before the posterior angles which are therefore slightly 



