Casey — Observations on the Staphylinidae. 317 



throughout, especially on the abdomen, least close on the elytra, which 

 are also micro-reticulate; pubescence fine, plumbeous and inconspicu- 

 ous; head inflated toward base, the eyes moderate, not prominent; 

 antennae attaining basal third of the elytra, gradually and distinctly 

 incrassate distally, thesubapical ioints transverse, the eleventh obtusely 

 pointed, not quite as long as the three preceding combined, the second 

 almost as long as the next two together; prothorax twice as wide as 

 the head and nearly three-flfths wider than long, the sides etrongly con- 

 verging from base to apex, the basal angles distinct and but little 

 rounded, the surface unimpressed ; elytra equal in width to the prothorax 

 and very slightly longer; abdomen at base evidently narrower than the 

 elytra, moderately tapering thence to the tip, the second impression 

 nearly as deep as the first, the third feeble. Length 2.7 mm.; width 

 0.67 mm. Ontario (Trenton) lacustrls n. sp. 



Body rather stouter and less convex, dull, the abdomen shining, dark cas- 

 taneous, the abdomen and antennae, except the basal joint of the latter, 

 blackish, the legs pale red-brown; punctures very fine and dense, gr&n- 

 uliform on the elytra, asperulate and much less close -set on the abdo- 

 men; pubescence fine, dense, pale and conspicuous, longer and less 

 evident on the abdomen ; head transverse, the eyes large but not at all 

 prominent; antennae almost attaining basal third of the elytra, gradu- 

 ally and strongly incrassate distally, the subapical joiQts moderately 

 transverse, the eleventh evidently longer than the two preceding com- 

 bined, the second but slightly longer than the third; prothorax only 

 feebly narrowed from base to apex, four-flfths wider than the head, 

 fully two-flfths wider than long, the basal angles broadly rounded, the 

 surface wholly unimpressed; elytra parallel with slightly arcuate sides, 

 everywhere obviously narrower than the prothorax and only slightly 

 longer; abdomen at base very distinctly narrower than the elytra, 

 moderately and evenly tapering thence to the tip, the sides straight, 

 the three basal impressions rather wide and distinct, the third less deep. 

 Length 2 75 mm. ; width 0.7 mm. Nevada (Reno) nevadensis n. sp. 



17 — Form rather stout, moderately convex, narrowed anteriorly and pos- 

 teriorly, dull in lustre, black or piceous-black throughout, the elytra 

 very slightly paler and more rufous, the punctures throughout exces- 

 sively minute and dense, not at all asperulate even on the abdomen; 

 pubescence very short, dense, slightly fuscous and moderately distinct ; 

 head wider than long, not inflated at base, the eyes large but not promi- 

 nent; antennae thick, extending to the middle of the elytra, the sub- 

 apical joints evidently though not strongly transverse, the eleventh not 

 as long as the preceding three combined, the first three equal in length 

 and elongate, the first slightly the thickest; prothorax one half wider 

 than the head and about two-fifths wider than long, the surface convex, 

 very feebly impressed along the median line throughout, with a deeper 

 rounded Impression of the same width before the middle of the base; 

 elytra large, at base equal in width to the prothorax, at apex very dis- 

 di-stinctly wider, two-fifths longer; abdomen at base broad but narrower 

 than the elytra, strongly tapering thence to the tip, with the sides feebly 

 and evenly arcuate, the first impression alone distinct, the second and 

 third obsolete; metasternal projection angulate, advancing between 



