Casey — Observations on the Staphylinidae. 291 



of the basal width, the bottom of the inclosed sinus feebly and broadly 

 lobed, the apex of the lobe with two small acute and approximate 

 cusps, the adjoining surface feebly and obliquely bitumorose; female 

 with the sixth tergite broadly arcuato-truncate at tip. Length 1.9-3.0 

 mm.; width 0.68-0.88 mm. New York (Catskill Mts.) and Pennsylvania 

 Westmoreland Co.) Titrina n. sp. 



Prothorax much narrower than the base of the elytra, generally distinctly 

 obtrapezoidal in form 3 



3 — Fourth antennal joint elongate; antennae pale. Body stout In form, 

 rather convex, shining, dark in color, the head black, the prothorax 

 and entire abdomen, except feebly toward base, blackish-piceous, the 

 latter flavescent at tip, varying to entirely pale with a narrow fascia; 

 elytra flavo- testaceous, blackish at the external apical angles; legs 

 and antennae flavate; head strongly, the pronotum and abdomen more 

 feebly though obviously micro-reticulate, the elytra very obsoletely so; 

 head as in vitrina, but with more numerous and smaller sparse punctures 

 toward the sides; prothorax slightly, though evidently, wider than the 

 head, one-half wider than long, rounded at the sides anteriorly, thence 

 strongly narrowed toward base, the latter broadly, evenly arcuate and 

 finely reflexed, the surface with two medial longitudinal series of 

 punctures, also feebly biimpressed before the scutellum, the impressions 

 with some fine nude punctules; elytra a third wider and longer than 

 the prothorax, the humeri rather widely exposed, rounded, the punc- 

 tures very fine and sparse, nearly as in vitrina; abdomen wide, nar- 

 rowed slightly toward tip. Male with the sixth tergite broadly arcu- 

 ato-truncate at tip, the apex having a very shallow, circularly rounded, 

 abruptly formed sinus about a fourth as wide as the segment, the sinus 

 with two very small tuberculous asperities almost equally trisecting its 

 width, or more approximate, the ends of the sinus each marked by a 

 small oblique compressed tubercle, generally not projecting posteriorly 

 behind the edge, the surface before the sinus with two more distinct 

 and rather widely separated and numerous smaller setigerous tubercles; 

 female with the sixth tergite arcuato-truncate throughout the width. 

 Length 2.0-2.6 mm.; width 0.66-0.8 mm. New York (Catskill Mts. to 

 Lake Superior) flavicornis n. sp. 



Fourth antennal joint not all elongate, rounded or feebly obtrapezoidal; 

 antennae dark ; smaller species ♦ 



4 — Form moderately stout and shining, dark in color, the entire surface 

 strongly micro -reticulate, the abdomen rather more finely; head and an- 

 tennae black, the three basal joints of the latter fiavate; prothorax black- 

 ish, the elytra flavo-testaceous, black atthe outer apical angles, the abdo- 

 men rufo-testaceous, with the fourth and most of the adjoining tergites 

 black; legs fiavate; head finely, sparsely punctate laterally, the antennae 

 rather stout distally, but little longer than the head and prothorax, the 

 latter strongly transverse, about three-fourths wider than long, slightly 

 but. distinctly wider than the head, feebly obtrapezoidal, rounded at 

 the sides anteriorly, the apical and post-median pairs of punctures most 

 distinct; elytra a third wider and one-half longer than the prothorax, 

 the humeri well exposed, rounded, the punctures fine, distinct externally 

 toward tip, obsolete toward the scutellum; abdomen somewhat arcu- 



