Casey — Observations on the Staphylinidae. 369 



becorainn; very approximate but generally not quite united at base; 

 under surface without a longitudinal impression at the sides, the latter 

 obtusely subprotninent inferiorly die simply to the flattening of the 

 general under surface; tarsi more slender and filiform; punctures of the 

 head and pi-onotum much less coarse, the latter more numerous in the 

 series. Palaearctic and Nearctic regions Leptacinodes 



18 — Antennae nearly as in Leptacinus, the second joint visibly longer but 



scarcely thicker than the third, both slightly elongate; fourth palpal 

 joint long, slender, somewhat longer than the third as a rule but conical 

 and gradually, acutely pointed; gular sutures fine, arcuate, uniting 

 near the base; sides of the bead not modified; frontal grooves rather 

 short, moderately distinct, subparallel, the ocular grooves wholly 

 obsolete; punctures only moderately coarse but very numerous on the 

 head and pronotum ; species rather small, similar in size and form to 

 Leptacinodes and rather smaller as a rule than in Leptacinus. Nearctic 



regions Stictolinus 



Antennae well developed, the second joint much elongated, nearly equaling 

 the next three combined, the third about equally slender, slightly elon- 

 gate, the outer join's stouter than in Leptacinus and more compactly 

 joined; fourth palpal joint very slender, aciculate and oblique, as long 

 as the preceding or nearly so; gular sutures very fine, arcuato, most 

 approximate at base, where they are still distinctly separated; sides of 

 the head broadly convex, unmodified, the basal angles broadly rounded; 

 neck slightly more than a third as wide as the head, nearly as in Sticto- 

 linus; median pair of frontal grooves short and almost completely ob- 

 solete, the ocular grooves very oblique, deep and conspicuous, departing 

 from the general rule; punctures of the head and pronotum fine and 

 rather sparse, very inconspicuous; body very small, slender, convex 

 and parallel, the abdomen convex and more str jngly sculptured than 

 usual; legs slender, the tarsi filiform. Pacific coast of America 



Habrolinus 



19 — Anterior tarsi slender and undilated, glabrous beneath or with a few 



sparse bristles; side margins of the prothorax and hypomera as in 



Xantholinus 20 



Anterior tarsi broadly dilited, especially in the male, densely clothed be- 

 neath with white papilloss pubescence; side margins of the prothorax 

 distinct throughout, these and the hypomera as in Gijrohypnus and 

 related genera; p-'onotura with dorsal series, the surface tlience antero- 

 lateriUy with irregularly scattered and very sparse punctures; middle 

 coxae more or less narrowly separated; body polished, with distinct 

 sparse punctures, the head above and beneath and pronotum minutely 

 strigilata in transverse wavy lines or with some modification of this 

 sculpture ; gular sutures feebly arcuate, becoming confluent at or slightly 

 behind the middle; sides of the head scarcely at all modified, almost 

 evenly convex, the punctures generally sparser along the middle of the 

 convexity; antennae moderate, only slightly thickened distally, the third 

 joint generally a little longer than the second; neck about two-fifths 



as wide as the head ; tibiae spinulose as usual 26 



Anterior tarsi broadly dilated in both sexes and clothed densely beneabt 



