Casey — Observations on the Staphylinidae. 427 



antennae in the former, as long as wide in the latter, parallel at the 

 sides; antennae with the second and third joints about equal in length 

 and thickness in both sexes and each somewhat shorter than the fourth 

 and fifth combined; surface almost impunctate but with the usual setig- 

 erous punctures, a few along the base, a larger one at the sides behind 

 and another above each eye, also one or two behind the point of antennal 

 insertion, and, on the front, in transverse line just behind the large 

 feeble frontal impression, there are two smaller punctures separated 

 by about a fifth of the iaterocular width; prothorax as wide as the head 

 in the male, just visibly wider in the female, between a fifth and sixth 

 longer than wide, parallel and feebly arcuate at the sides with broadly 

 rounded angles, the surface with the usual punctures and very minute 

 wavy strigilatiou; elytra unusually small, quadrate, equal in width to 

 the prothorax but much shorter, subimpunct&te and only very feebly 

 rugulose, shining; abdomen as wide as the elytra, finely, sparsely 

 panctate, obsoletely so toward the middle. JUale with the sixth ven- 

 tral narrow, transversely and rt'ctilinearly truncate at lip, the female 

 ■with the apex of the same segment broadly, evenly rounded. Length 

 5.8 mm.; width 0.78 mm. Idaho (Coeur d' Alene), — H. F. Wickham, 



qnadripennis n. sp. 



Body not parallel, the head small in both sexes and the elytra relatively 

 larger i 



4 — Form rather stout in the male, less so in the female, shining, the head 

 and abdomen pale piceo-rufous, the prothorax clear and pale rufous, 

 the elytra black, with the basal margin and sutural bead nubiliously 

 pale; legs and antennae pale ferruginous; head behind the antennae 

 very slightly transverse in the male, about as long as wide in the fe- 

 male, parallel, with the usual setigerous punctures as in quadripennis ; 

 prothorax much wider than the head in both sexes, with parallel and 

 feebly arcuate sides and broadly rounded angles, only just visibly longer 

 than wide in the male, narrower and fully a sixth longer than wide in 

 the female, the usual dorsal punctures well developed in the lattwr sex, 

 the transverse median pair wholly obsolete in the male; elytra rather 

 large, quadrate, evidently shorter and wider than the prothorax in both 

 sexes, shining and but feebly rugulose, with some very fine and sparsely 

 scattered nude punctules; abdomen parallel, nearly as wide as the 

 elytra, the fine asperate punctures strong and conspicuous, only moder- 

 ately sparse and but slightly lees developed along the median parts. 

 Male with the fifth ventral feebly sinuato-truncate, the sixth much nar- 

 rower, with a feeble rounded apical sinus half as wide as the entire 

 segment and about six times as wide as deep, the second antennal joint 

 evidently shorter than the third and of about equal thickness, the latter 

 as long as the fourth and fifth combined; female with the sixth ventral 

 broadly, evenly rounded at tip, the second antennal joint fully as long 

 as the third and thicker, the latter not as long as the next two com- 

 bined. Length 4.8-5.4 mm. ; width 0.83-0.9 mm. California (Lake 

 Tahoe) pnHctirentris Fall 



Form more slender, the size smaller, equally convex and shining, pale and 

 almost uniform testaceous throughout the body, legs and antennae, the 

 elytra nubilously and gradually shaded with blackish or piceous behind 

 basal two-fifths or thereabouts; head about as long as wide behind the 



