STAPHYLINID/E. 7 



having its apex feebly sinuato-truncate and its lateral limits marked by very 

 obtusely rounded unthickened angulations. Length 2.4 mm.; width 0.6 mm. 

 Rhode Island (Boston Neck). 



Distinguishable from affluens principally by the notably different 

 sexual modification of the sixth tergite of the male. Superficially, 

 the species of this section of Atheta resemble each other very closely 

 throughout. 



Atheta (Stethusa) sagax n. sp. Smaller than any of the preceding and with 

 relatively shorter prothorax and elytra, similar in coloration and sculpture; 

 head rather more transverse, very much narrower than the prothorax, the 

 large eyes similar, and, as usual, finely faceted and having a few stiff bristling 

 setae; antennae rather less developed but of the same type, the last joint 

 fully as long as the preceding two, the latter each but little shorter than wide, 

 prothorax nearly one-half wider than long, parallel and broadly rounded at 

 the sides, evidently narrower than the elytra; the basal angles distinct as 

 usual; elytra pale brownish-flavate, feebly clouded toward the scutellum; 

 the suture but little longer than the prothorax; abdomen blackish, faintly 

 rufescent basally and at apex, the sixth tergite ( cf ) with the medial truncature 

 not more posterior than the tips of the slender dentiform process at each 

 side of the apex and separated therefrom by nearly its own width, its apex 

 faintly sinuato-truncate and its subangulate ends rounded and not at all 

 thickened. Length 2.2 mm.; width 0.58 mm. Virginia (Norfolk). 



Separable from any of the preceding by its rather smaller head 

 and prothorax and smaller size of the body, as well as by differences 

 in the male sexual characters. 



Atheta (Stethusa) sororella n. sp. More slender than any of the preceding 

 species and rather small in size, similar in coloration and sculpture; head 

 moderate, the eyes large, convex, extending almost to the base; antennae 

 well developed, the last joint as long as the two preceding; prothorax trans- 

 verse, parallel, very much wider than the head and a little narrower than the 

 elytra, the latter short and transverse, the suture not longer than the pro- 

 thorax; abdomen much narrower than the elytra, rather shining, sparsely 

 punctulate as usual, the lateral margins scarcely at all elevated, the sixth 

 tergite (cf) with the apical lobe not projecting beyond the lateral processes 

 and very wide, subsinuate medially and with very widely rounded unthick- 

 ened angles, separated from each slender lateral process by but little more 

 than half of its own width. Length 2.5 mm.; width 0.56 mm. New 

 York (Catskill Mrs.). 



The slender form and broad, feebly defined lobe of the sixth male 

 tergite will probably prove efficient determinative characters for 

 this species. 



Atheta (Stethusa) subdebilis n. sp. Moderately stout, small in size, 

 colored as in the preceding species, the fine close sculpture also similar; head 



