Casey — Observations on the Staphylinidae. 207 



about as long as the next two combined in the male, the first four 

 evenly decreasing in the female ; sixth ventral of the male feebly sinuato- 

 truncate, rounded in the female. Length 2.8 mm.; width 0.48 mm. 

 New York (Ithaca and Catskill Mts.), Pennsylvania and Iowa. 



americana n. sp. 



Legs clear honey-yellow throughout, smaller species, the pronotum in the 



female generally distinctly impressed along the median line ... 6 



6 — Form very slender, more convex, the prothorax only very slightly wider 



than long, broadly rounded at the sides anteriorly and very distinctly 

 narrowed thence to the base. Body blackish-piceous in color, the abdo- 

 men blacker, with the two basal segments rufous; antennae pale, fuscous 

 toward tip. Male with the integuments polished and free from reticu- 

 lation throughout; head finely punctulate throughout, not evidently 

 impressed, rather abruptly constricted at the base, the antennae much 

 shorter than usual, scarcely extending to basal third of the elytra, 

 somewhat thick but only moderately incrassate distally, the second 

 joint much longer than the third, the tenth barely as long as wide; pro- 

 thorax very slightly wider than the head, convex, polished, minutely 

 and closely punctulate, narrowly and very feebly, obsoletely impressed 

 along the median line behind the middle; elytra nearly as long as wide, 

 a third wider and two-fifths longer than the prothorax, finely, asper- 

 ately and rather closely punotulate, with very narrowly exposed humeri; 

 tarsi slender, the basal joint of the posterior as long as the next two 

 combined; sixth ventral with a small angular emargination about twice 

 as wide as deep. Female throughout proportioned nearly as in the 

 male but with the surface of the head and pronotum very minutely, 

 strongly reticulate and dull, the head somewhat deeply concave at the 

 middle of the vertex, the pronotum very deeply and broadly concave 

 along the median line throughout, the punctures of the impressed area 

 very minute and only moderately close, those outside of the impression 

 strongly asperate and dense; sixth ventral rounded at tip. Length 2.2 



mm.; width 0.45 mm. North Carolina (Asheville) carolinae n. sp. 



Form less slender, the prothorax distinctly wider than long, broadly 

 rounded at the sides anteriorly but only very slightly narrowed thence 

 to the base, the sides just visibly converging 7 



7 — Head moderately developed, only slightly narrower than the pro- 



thorax 8 



Head small, much narrower than the prothorax, 9 



8 — Color rufo-piceous, the abdomen black, the two basal segments rufous ; 



antennae pale, slightly infuscate apically ; integuments in the male pol- 

 ished and free from micro-reticulation throughout; vestiture not very 

 conspicuous; head minutely, sparsely punctulate, not impressed; an- 

 tennae feebly developed, extending to about basal third of the elytra, 

 only slightly incrassate distally, the second joint as long as the first and 

 much longer than the third, the subapical joints not as long as wide; 

 prothorax about a fourth wider than long, not impressed at any point, 

 the punctulation very fine and only moderately close-set, the interstices 

 polished, not reticulate; elytra about a third wider and fully two -fifths 

 longer than the prothorax, the punctulation feebly asperate and not very 

 close, paler in color at apex; basal joint of the hind tarsi not quite ;as 



