STAPHYLINID.*:. 35 



An exceptional species, in the present restricted group, in its 

 stouter form, finely margined, tapering and more densely sculptured 

 abdomen and many other structural features. 



Oxypoda affecta n. sp. Very slender as in perexilis; coloration and 

 sculpture nearly as in the preceding, except that the head and all the 

 abdomen, except the fine segmental apices, are paler piceous; head well 

 developed, nearly two-thirds as wide as the prothorax, a little wider than 

 long, feebly inflated basally, the eyes not prominent and at their own 

 length from the base; antennae short, rather slender, only feebly incrassate, 

 blackish, paler basally, the third joint much shorter than the second, 

 fourth fully as long as wide, the outer joints strongly obtrapezoidal, 

 fully one-half wider than long, the last unusually small, not longer than 

 the two preceding and not at all inflated; prothorax relatively large, 

 two-fifths wider than long, the sides very feebly converging and sub- 

 evenly and rather feebly arcuate from the obtuse and blunt basal angles 

 to the apex, the base rounded, the surface unimpressed; elytra small, 

 parallel, narrower than the prothorax, the suture distinctly shorter than 

 the latter, the apical sinuses well developed; abdomen narrow, slender and 

 subparallel, the very feeble even taper almost unobservable, slightly 

 narrower than the elytra, the margins not notably thick, the fifth tergite 

 very long, more than one-half longer than the fourth. Length 2.2 mm.; 

 width 0.4 mm. Mississippi (Vicksburg). 



Allied to perexilis but differing in its much larger head, more 

 slender and less incrassate antennae, with a much smaller, less 

 stout and less constricted terminal joint; also in its relatively 

 broader prothorax, with less rounded sides. 



Oxypoda tenuicula n. sp. Not quite so slender as the preceding and 

 pertenuis and with much more anteriorly narrowed prothorax, nearly 

 similar in coloration, sculpture and vestiture, the abdominal asperities 

 rather finer, closer and more uniform than usual though strong; head 

 moderate, subtriangular, wider than long, the eyes moderate; antennae 

 longer than in the preceding, gradually moderately incrassate, infuscate, 

 paler basally, the third joint much shorter than the second, fourth 

 rather longer than wide, the fifth slightly transverse, the tenth less than 

 one-half wider than long, the last fully as long as the preceding two, 

 abruptly narrowed and compressed apically; prothorax large, inflated 

 basally and widest behind the middle, the sides rounded, strongly con- 

 verging and less so anteriorly, one-half wider than long, with rounded 

 base as usual; elytra perfectly parallel, only moderately transverse, 

 much narrower than the prothorax, the suture equal in length to the 

 latter; abdomen narrow and slender, evidently narrower than the elytra, 

 only just visibly tapering, with straight sides and moderate margins, to 

 the fifth tergite, which is rather more than one-half longer than the fourth. 

 Length 1.8-2.2 mm.; width 0.38-0.45 mm. Iowa (Iowa City and 

 Cedar Rapids). 



