Casey — Observationa on the Staphylinidae. 271 



than the head, broadly arcuate at base, minutely, asperately and mod- 

 erately closely punctate, broadly, feebly Impressed In the middle before 

 the base ; elytra at base equal in width to the prothorax, at apex but 

 little wider, one- half longer, slightly transverse, finely, feebly and 

 closely punctate, each somewhat obliquely impressed behind the scu< 

 tellum; abdomen much narrower than the elytra, gradually tapering 

 almost from the base, finely, closely and almost evenly punctured, more 

 sparsely posteriorly, the basal impressions rather narrow and feeble. 

 Length 2.2-2.5 mm.; width 0.7-0.76 mm. New York (CatskiU Mts.) 

 and Pennsylvania (near Philadelphia). 1== Bolitochara marg. Csy.]. 



marglnella Csy. 

 Form slender, much smaller in size, dull in lustre and similarly sculptured, 

 the punctuation throughout fine, asperulate and close-set, pale brownish 

 flarate in color, the head piceous, the elytra scarcely at all darker at 

 tip, the abdomen with a piceous cloud involving the fourth tergite; 

 head convex, well developed, the antennae stout, fuscous, paler toward 

 base, scarcely longer than the head and prothorax, strongly Incrasaate 

 distally, the outer joints rather compactly joined and strongly trans- 

 verse; proihorax about a third wider than the head and less than one- 

 half wider than long, convex, not distinctly impressed, subparallel with 

 the sides broadly arcuate, the base rounded; elytra slightly transverse, 

 equal in basal width to the prothorax and about a third longer, the 

 humeri not at all exposed, the suture slightly impressed behind the 

 Bcutellnm; abdomen obviously narrower than the elytra, subparallel, 

 finely, very sparsely punctured, the vestlture much longer and coarser. 

 Length 1.35 mm.; width 0.45 mm. Pennsylvania (near Philadelphia). 



nanella n. sp. 



The male of marginella has a very small rounded tubercle 

 on the median line of the fifth tergite, at some distance from 

 the apex, with the punctures not more conspicuously asperate 

 than on the other tergites, the sixth having a similar but 

 more elongate flattened discal tubercle and the apex broadly 

 sinuate throughout the width, the edge having six or eight 

 serrulations not continued onto the disk. In nanella the ab- 

 dominal sculpture throughout is very much sparser than in 

 marginella and the tubercle of the fifth tergite is rather larger, 

 more elongate and nearer the apex, with the sparse punctures 

 elongato-asperate, the sixth being narrower and sinuato- 

 truncate at tip, with four rather strong rounded denticles 

 continued forward onto the surface by convex longitudinal 

 ridges, the surface anteriorly in great part covered by the 

 fifth tergite in the unique type. 



