STAPHYLINID.E 173 



tenth a little shorter than the ninth but as long as wide, the last as long 

 as the two preceding; prothorax just visibly wider than long, slightly 

 widest but little before the middle, the sides broadly rounded, slightly 

 converging and less arcuate basally, more rounded and converging api- 

 cally, the surface with a feeble indentation in median fourth from near 

 the apex, obsolescent near the base; elytra two-fifths wider and a fourth 

 longer than the prothorax, the humeri moderately exposed at base; 

 abdomen slender, inflated posteriorly, minutely, very remotely punctate 

 and with coarse sparse hairs, the first three tergites much longer than 

 the fourth, the fifth still shorter. Length 3.0 mm.; width 0.58 mm. 

 Virginia (Fredericksburg). 



Distinguishable from gracillima Lee., by the less rapidly and 

 much less strongly incrassate distal part of the antennae and rela- 

 tively much broader prothorax and elytra. 



Tachyusa silvatica n. sp. More slender, strongly convex, much less 

 shining, subalutaceous, finely, very closely punctured and pubescent 

 throughout, the three tergitical impressions with the coarse punctures 

 longitudinally confluent, producing numerous fine carinae which are 

 but little less pronounced than the medial carinule; color blackish- 

 castaneous, the elytra but faintly paler, the first two tergites testaceous, 

 the legs pale brown; head but slightly wider than long, as wide as the 

 prothorax, the eyes at their own length from the base, the equally pro- 

 minent tempora forming an even circular arc to the base, becoming 

 parallel behind the eyes; antennae moderately thick, rather long, piceous, 

 gradually and distinctly incrassate, the first two joints subequal in 

 length, the third but little shorter, fourth two-thirds, the fifth one-third, 

 longer than wide, ninth almost as long as wide, the tenth a third wider 

 than long, the last distinctly shorter than the two preceding; prothorax 

 convex, somewhat shining, as long as wide, slightly widest a little before 

 the middle, the sides broadly rounded, becoming more convergent but 

 arcuate apically, slightly converging and straight thence to the base, 

 the surface in the type wholly unimpressed, excepting a subobsolete 

 transverse ante-scutellar indentation; elytra about as long as wide, 

 parallel, the sides rounding and feebly converging posteriorly, a fourth 

 longer and scarcely a third wider than the prothorax, the humeri slightly 

 exposed at base; abdomen slender basally, dilated posteriorly, the fourth 

 and fifth tergites equal in length, shorter than one to three. Length 

 2.8 mm.; width 0.4 mm. New York (Ithaca). 



Differs from americana Csy., in its denser fine punctures, larger 

 head, with more broadly rounded basal angles, much more incras- 

 sate and less slender outer part of the antennae; in having the 

 widest part of the narrower prothorax slightly less anterior, in its 

 paler coloration and in many other respects. The type of americana 

 is from the Catskill Mts., but the Pennsylvania and Iowa examples 

 seem to be identical. 



