Casey — Observations on the Staphylinidae. 199 



dently longer than the third, the subapical as long as wide in the 

 male, rather more elongate in the female, the eleventh pointed and 

 apparently impressed laterally at apex; prothorax scarcely visibly 

 wider than the head in the male, distinctly so in the female, a fifth 

 wider than long in the former and fnlly a fourth in the latter, widest 

 and broadly rounded at the sides near apical third, the sides thence 

 feebly converging and almost straight to the base; surface with a 

 small, transverse and approximately bifoveate impression before the 

 scutellum in both sexes, the median line finely impressed almost 

 throughout, very obsoleiely in the female; elytra nearly one-half 

 wider and longer than the prothorax, feebly impressed behind the 

 scutellum, the humeri well exposed at base; abdomen parallel and 

 straight at the sides, distinctly narrower than the elytra, the moderately 

 coarse punctures of the basal impressions well separated. Male with the 

 sixth ventral plate broadly, feebly sinuate in about median third. 

 Length 8.0 mm.; width 0.8 mm. Oregon (Portland), — H. F. Wickham. 



oregona n. sp. 

 Head distinctly narrower than the prothorax in the female, probably less 

 obviously so in the male, the neck broad as in the two preceding spe- 

 cies. Form moderately stout and convex, polished, the punctures fine 

 and rather sparse throughout, closer toward the apex of the abdomen, 

 piceous- black, the elytra somewhat paler; legs dark testaceous, the 

 antennae blackish; head transverse, arcuately narrowed at base, the 

 eyes rather large, the surface concavely impressed along the mediam 

 line from near the front to the base of the occiput; antennae extend- 

 ing beyond the middle of the elytra, slender, feebly incrassate dis- 

 tally, the second joint distinctly longer than the third, the subapical 

 scarcely as long as wide, the eleventh pointed and laterally impressed 

 at tip ; prothorax transverse, nearly a third wider than long, of the 

 usual obtrapezoidal form, the sides rounded at apical third, the disk 

 having the usual feeble bifoveolate impression before the scutellum; 

 elytra transverse, two-fifths wider and a third longer than the pro- 

 thorax, narrowly and briefiy impressed on the suture at base, the 

 humeri moderately exposed and obliquely rounded; abdomen parallel, 

 distinctly narrower than the elytra, the moderately coarse punctures 

 of the basal impressions sparse, rather distinct in the first but virtually 

 obsolete in the third. Male unknown. Length 2.1 mm. ; width 0.63 mm. 



California (Yuma) impressiceps n. sp. 



Head smaller, much narrower than the prothorax, more strongly, arcuately 

 narrowed to the base or more orbicular, the neck narrower, barely 

 three -fifths as wide as the head. Form very slender, polished, black, 

 the abdomen toward base dark, and the legs and antennae pale, rufo- 

 piceous; punctures rather close-set but minute throughout, the pubes- 

 cence somewhat inconspicuous; head nearly as long as wide, with a 

 rounded impression at the middle of the vertex ; antennae distinctly 

 incrassate distally ; prothorax rather more than a fourth wider than 

 long, the sides broadly rounded anteriorly, thence distinctly converging 

 and straight to the obtuse but very conspicuous basal angles, the 

 surface as a rule not impressed along the median line except deeply near 

 the basal margin, but often broadly and irregularly concave — probably 



