STAPHYLINID.E. 51 



shorter, fourth as long as wide, fifth to tenth increasing in size but mutu- 

 ally similar in form and distinctly transverse, the last small, compressed 

 apically, not longer than the two preceding; prothorax three-fifths wider 

 than long, the sides strongly converging and not very arcuate from base 

 to apex, the base rounded, the impression feeble and evanescent; elytra 

 broad, rather strongly transverse, with diverging sides, at base fully as 

 wide as the prothorax, the suture impressed at base and barely a fourth 

 longer than the pronotum; abdomen much narrower than the elytra, 

 distinctly though moderately and evenly tapering, with straight sides 

 and thin margins, from base to apex, the fifth tergite transverse, barely 

 one-half longer than the fourth; all the tergites paler at apex, the apical 

 ones broadly. Length 1.65-1.85 mm. ; width 0.58-0.65 mm. Mississippi 

 (Vicksburg). 



Belonging, with the preceding, rigorously to the sejuncta group, 

 so well developed on the Pacific coast, but with much shorter elytra 

 than in any of the other species and very well characterized also 

 by the coloration of the body, and especially of the elytra. 



The three following species are merely in continuation of the 

 sejuncta group preceding, but they are smaller and very much 

 more slender, being narrowly subfusiform. Tenera, of Bernhauer, 

 belongs to this group but has a relatively smaller head, much smaller 

 antennae and less transverse prothorax than any here described, 

 besides being rather less convex: 



Oxypoda implicata n. sp. Slender, rather convex, alutaceous, piceous- 

 black, the prothorax, abdominal apex and apices of the basal tergites 

 paler and obscure rufous; punctures small but close, strongly asperulate 

 and equal on the pronotum and elytra, those of the abdomen finer but 

 not closer, the pubescence short, abundant; head well developed, a little 

 wider than long, fully three-fifths as wide as the prothorax, feebly dilated 

 basally, the eyes rather convex, at a little less than their own length from 

 the base; antenna? dark ochreous-brown, short, distinctly though moder- 

 ately incrassate distally, the second joint slightly longer than first or 

 third, fourth nearly as long as wide, the outer joints mutually similar in 

 form, distinctly transverse, the last obtusely pointed, not longer than the 

 two preceding; prothorax short, three-fifths wider than long, strongly 

 rounded at base, the sides distinctly converging and very moderately 

 arcuate from base to apex, unimpressed; elytra moderately transverse, 

 the sides only feebly diverging and very slightly arcuate, at base fully 

 as wide as the prothorax, the suture a fourth longer, impressed at the 

 scutellum, the apical sinuses deep; abdomen slender, distinctly narrower 

 than the elytra, just visibly tapering from base to the fifth tergite, which 

 is only slightly transverse and one-half longer than the fourth; basal 

 joint of the hind tarsi not as long as the next three. Length 1.75 mm.; 

 width 0.45 mm. California (suburbs of San Francisco). 



