Casey — Observations on the Staphylinidae. 297 



Form stout, fusiform, allied closely to insolens and almost similar in color- 

 ation and in the general nature of the male sexual characters, but 

 smaller, with more rapidly tapering abdomen and much more strongly 

 converging sides of the prothorax basally, polished, micro-reticulate 

 throughout,- the head black; prothorax pale, clouded along the middle, 

 the elytra pale, blackish on the flanks except at the humeri, broadly 

 along the apex and narrowly along the suture to the base; abdomen 

 pale rufous, clouded at and near the fourth tergite ; head with a few 

 sparse punctures as usual ; antennae stout, flavate, gradually infumate 

 distally, the fifth joint elongate, the others to the tenth gradually 

 shorter, the latter perceptibly wider than long; prothorax much wider 

 than the head, one-half wider than long, strongly obtrapezoidal, punc- 

 tured as usual; elytra two-fifths wider and one-half longer than the 

 prothorax, the humeri well exposed, the suture somewhat impressed, 

 the punctures rather more distinct than usual ; abdomen at base nar- 

 rower than the elytra, at apex very much narrower. Male with a feebly 

 tumid arc tangent posteriorly to the apex of the fifth tergite and occu - 

 pying about an eighth or ninth of its entire width; sixth with two short 

 and strong, inwardly directed processes in median third of the apex, 

 the inclosed sinus with about three feeble undulations, each bearing 

 a minute setose process; female with the asperate punctulation of the 

 abdomen distinct and close-set posteriorly toward the sides, the sixth 

 tergite rounded. Length 1.6-1.8 mm.; width 0.72-0.8 ram. Colorado 

 (Boulder Co. ) lanrana n. sp. 



Form rather stout, polished, feebly micro-reticulate throughout, flavate, 

 the head black, the elytra blackish on the flanks posteriorly and 

 broadly along the apex nearly to the suture, the black cloud on the 

 fourth tergite small ; head well developed, with a few rather coarse 

 punctures; antennae flavate, extending nearly to the middle of the 

 elytra, rather stout, loose as usual in this group, the flfth joint slightly 

 elongate, the tenth about as long as wide, the eleventh very nearly as 

 long as the two preceding combined; prothorax rather large, slightly 

 wider than the head, one-hail wider than long, the sides rounded in 

 nearly apical half, thence distinctly converging and straighter to the 

 base, the latter arcuate, the punctures as usual; elytra a third wider 

 and two-fifths longer than the prothorax, the humeri rounded and 

 moderately exposed, the punctures minute ; abdomen at base nearly as 

 wide as the elytra, rapidly narrowed thence to the tip, the sides 

 almost straight except near the apex, the surface smooth, almost wholly 

 devoid of minute asperate punctures posteriorly in the female. Male 

 unknown. Length 1.5-1.8 mm.; width 0.7 mm. Missouri (St. Louis.). 



conicirentris n. sp. 



Form nearly similar but smaller and with a relatively smaller prothorax, 

 polished, feebly micro-reticulate throughout, fiavate, the head black, 

 the elytra less reddish, barely at all infumate near the external apical 

 angles, the abdominal cloud small and feeble; head as usual; antennae 

 fully attaining basal third of the elytra, rather less ttout than in coni- 

 civentris and sensibly infumate distally, the fifth joint as long as wide, 

 the tenth rather wider than long, the eleventh almost as long as the 

 two preceding combined; protliorax much wider than the head, in out- 



