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than the prothorax; abdomen perfectly parallel, much narrower than the elytra, the first three tergites strongly impressed, the sixth (♂) broadly lobed at apex, the lobe arcuato-truncate, with a faint median projection, the apex at each side of the base of the lobe feebly concave; mesosternal process rather broad and truncate at apex, extending to the middle of the separated coxæ and considerably distant from the apex of the elongate metasternal projection, which has its apex rounded; hind tarsi rather short, the first four joints equal. Length 2.2 mm.; width 0.6 mm. Ohio (Cincinnati),—Dury. |
This remarkable species can be known at once by the elytra of the male, each having a distinct umboniform tubercle just before the middle and at inner third; the absence of cephalic carinæ and rather wide truncate mesosternal process are also conspicuous distinctive characters.
| Atheta nevadensis n. sp.—Elongate, very moderately convex, polished throughout, the micro-reticulation obsolescent; color piceo-testaceous, the head and abdomen blackish; legs pale, the antennæ dark brown throughout; vestiture rather short and not at all dense; head orbicular, the eyes at rather more than their own length from the base, the carinæ fine and not extending before the middle; antennæ gradually thick and very strongly incrassate, the outer joints slightly transverse; the eleventh rather longer than the two preceding, the second and third equal; prothorax moderately transverse, much wider than the head and correspondingly narrower than the elytra, parallel and strongly rounded at the sides, very finely, sparsely punctulate, the basal impression somewhat rounded, very feeble; elytra but slightly transverse, very much longer as well as wider than the prothorax, minutely, not densely punctulate; abdomen parallel, slightly narrower than the elytra, sparsely, very finely punctulate, the fifth tergite very slightly longer than the fourth, the sixth (♂) truncate and very finely and feebly crenulate at tip; mesosternal process extending beyond the middle of the slightly separated coxæ, the apex attenuate and very finely aciculate, separated from the very short and broadly rounded metasternum by a long depressed smooth ridge; posterior tarsi rather long, the first four joints equal. Length 3.2 mm.; width 0.73 mm. Nevada (Reno). |
The elongate form, shining integuments, rather small and transversely oval prothorax, feeble male sexual characters, thick and incrassate antennæ and sternal structure will render the identification of this species comparatively easy.
The following thirteen species are small forms, apparently inhabiting fungi, having pale elytra and legs, the abdomen more of less evidently paler basally, the antennæ moderately stout and subparallel except basally, or, at most, very moderately incrassate, and with the sixth tergite of the male auriculate at the sides of the apex, with the intervening edge in no case crenulate. These are
