Staphylinidæ.
11
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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) oregonia n. sp.—Moderately stout, black, the elytra dark brown, the abdominal tip slightly pale, the legs and antennæ 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; antennæ 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 humeri much exposed at base, the surface strongly micro-reticulate, the fine punctuation thereby rendered indistinct; abdomen wide, but little narrower 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 (♂) broadly sinuato-truncate at apex. Length 3.6 mm.; width 0.83 mm. Oregon (Lane Co.). |
Allied rather closely to fuscula Csy., from Cœur d’Alene, but with relatively larger head and smaller and more transverse prothorax; the sex of the type is not altogether certain as announced above.
| Atheta (Homalotusa) mormon n. sp.—Form more slender, black throughout, the elytra and legs piceous-black, the lustre strongly shining though distinctly micro-reticulate, the punctures minute, feebly and very indistinctly granuliform as in the preceding; pubescence rather sparce; head convex, parallel, the eyes at their own length from the base; antennæ very slender, the second joint much longer than the third, the tenth distinctively 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 structure.
| Atheta (Homalotusa) lacustrina n. sp.—Rather stout, more parallel than usual, feebly shining and pubescent, the abdomen more shining and with |
