STAPHYLINID^. n 



as the fourth and feebly trapezoidal. Length 3.2 mm.; width 0.92 mm. 

 Oregon (Lane Co.). 



Quite distinct from any other species in its much stouter form, 

 short fifth ventral and many other features. 



Atheta (Homalotusa) oregonina n. sp. Moderately stout, black, the elytra 

 dark brown, the abdominal tip slightly pale, the legs and antennae as in lanei; 

 pubescence finer and more abundant, the lustre duller throughout; head 

 relatively larger, convex, moderately shining, the eyes smaller, at a little 

 more than their own length from the base; antennae long, scarcely incrassate, 

 the tenth joint feebly obtrapezoidal and not quite so long as wide; prothorax 

 formed as in lanei but smaller, a fourth wider than the head and more evidently 

 narrower than the elytra, the parallel sides evenly rounded; surface evenly 

 and feebly convex, the basal impression obsolete, the punctulation very fine 

 and indistinct; elytra large, slightly transverse, not quite parallel, the hu- 

 meri much exposed at base, the surface strongly micro-reticulate, the fine 

 punctulation thereby rendered indistinct; abdomen wide, but little nar- 

 rower than the elytra, with parallel and nearly straight sides to the tip of 

 the fifth segment, not very closely, minutely punctulate throughout, the sixth 

 tergite (cf) broadly sinuato-truncate at apex. Length 3.6 mm.; width 0.83 

 mm. Oregon (Lane Co.). 



Allied rather closely to fuscula Csy., from Coeur d'Alene, but 

 with relatively larger head and smaller and more transverse pro- 

 thorax; the sex of the type is not altogether certain as announced 

 above. 



Atheta (Homalotusa) mormon n. sp. Form more slender, black through- 

 out, the elytra and legs piceous-black, the lustre strongly shining though dis- 

 tinctly micro-reticulate, the punctures minute, feebly and very indistinctly 

 granuliform as in the preceding; pubescence rather sparse; head convex, 

 parallel, the eyes at their own length from the base; antennae very slender, 

 the second joint much longer than the third, the tenth distinctly longer than 

 wide; prothorax about a fourth wider than long, much wider than the head 

 and narrower than the elytra, apparently a little narrower at apex than at 

 base, the sides broadly arcuate; surface rather convex, shining, the transverse 

 impression at the base very short and subobsolete; elytra large, slightly 

 transverse, very much wider and longer than the prothorax, the straight sides 

 feebly diverging from base to apex, the surface nearly flat, shining; abdomen 

 rather wide, parallel, the fifth tergite distinctly longer than the fourth, 

 the sixth rounded in the type. Length 3.2 mm.; width 0.78 mm. Utah 

 (southwestern) , Weidt. 



Not closely allied to any other species but belonging to the same 

 subgenus as the preceding, as shown by sternal and general struc- 

 ture. 



Atheta (Homalotusa) lacustrina n. sp. Rather stout, more parallel than 

 usual, feebly shining and pubescent, the abdomen more shining and with 



