Casey — Observations on the Staphylinidae. 295 



elytra, the outer seven joints formina; a long loose stout and parallel 

 club, joints five to eisht distinctly longer than wide, the next two 

 fully as long as wide, the eleventh much shorter than the two preced- 

 ing combined; prothorax only slln;htly wider thaa the head, one-half 

 wider than long, feebly obtrapezoidal, the sides more rounded an- 

 teriorly, the base broadly arcuate, the sparse punctures all feeble; 

 elytra well developed, two-fifths wider and fully one -half longer than 

 the prothorax, the humeri well exposed and rounded; abdomen at 

 base distinctly narrower than the elytra, thence moderately tapering 

 to the tip. Male having a small, feebly elevated semicircle in about 

 median tenth or less and near the apex of the fifth tergite, the open- 

 ing of the arc anterior; sixth with two short acd strongly inflexed pro- 

 cesses in median third of the apex, the inclosed sinus transverse at 

 the bottom, with the edges feebly undulated and bearing about five 

 very small setae, the surface scarcely modified, smooth and polished; 

 female with the sixth tergite truncate, otherwise unmodified. Length 

 2.2 mm.; width 0.78 mm. New Yorls (Catskill Mts.). antennalis n. sp. 

 Form moderately stout, polished, feebly micro- reticulate throughout, the 

 head black, the remainder rufo-flavate, the elytra flavate, blackish at 

 apex except toward the suture, the abdomen with a blackish cloud in- 

 volving the fourth and half of the fifth tergite; legs and antennae pale, 

 the latter gradually somewh&t iofumate distally, extending nearly to 

 the middle of the elytra, moderately stout, the fifth and sixth joints 

 elongate, the next two as long as wide, the ninth and tenth very slightly 

 wider than long, the eleventh distinctly shorter than the two preceding 

 together; head with rather numerous sparse punctures toward the 

 sides; prothorax very distinctly wider than the head, and, like the 

 latter, relatively larger than in antennalis but otherwise nearly similar, 

 except that the sides are virtually parallel; elytra nearly similar, except 

 Iq the blackish apex; abdomen but little narrowed behind, distinctly 

 narrower than the elytra. Male with sexual characters nearly like those 

 of antennalis, the arcuate tumidity at the middle of the fifth tergite near 

 but at some distance from the apex, much larger and occupying about 

 an eighth of the total width, the short strong and inwardly projecting 

 apical processes of the sixth, separated by a third of the width, nearly 

 similar, the transverse bottom of the inclosed sinus with three undu- 

 lations, each bearing a short seta; female with the sixth tergite broadly, 

 evenly arcuate at tip. Length 2.3 mm. ; width 0.78 mm. Lake Superior 



(Isle Royale) insolens n. sp. 



Form slender, polished, the head and abdomen distinctly, the elytra very 

 obsoleteiy, micro-reticulate, the pronotura without trace of reticu- 

 lation; head black, the prothorax piceous-black, the elytra pale silvery- 

 flavate, without distinct darker marking, the abdomen more rufous, 

 with the usual blackish cloud at the fourth tergite; head rather small, 

 with very few fine punctures at each side, the antennae clear flavate 

 throughout, rather slender, extending to about the middle of the elytra, 

 the fifth joint elongate, six to ten as long as wide; prothorax nearly 

 three- fifths wider than long, distinctly wider than the head, strongly 

 obtrapezoidal, the i^ides rounded anteriorly, thence srrongly converging 

 to the broadly arcuate base, the usual punctures distinct; elytra shorter 



