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Memoirs on the Coleoptera.
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subapical width, the coxæ separated; first four joints of the hind tarsi equal. Length 2.5 mm.; width 0.73 mm. Mississippi (Agricultural College),—H. F. Weed. |
Distinguishable easily by its stout form, sternal and sexual characters. The sternum, in connection with the larger eyes, might indicate close affinity with Stethusa, but the form of the body and smaller prothorax give a very different facies and the sexual characters are of a different order.
| Atheta arizonica n. sp.—Moderately stout and convex, somewhat alutaceous, the abdomen shining; piceous-black, the elytra and legs pale brownish-flavate, the antennæ blackish throughout; head as usual transverse, parallel, with rounded basal angles, finely, rather closely and asperulately punctate, the eyes convex and at barely their own length from the base, the carinæ fine but entire; antennæ rather slender and but feebly incrassate, the outer joints slightly wider than long, the second and third equal; prothorax much wider than the head and slightly narrower than the elytra, moderately transverse, the sides parallel and evenly arcuate, the basal angles obtuse and blunt, the surface finely, closely and asperulately punctate, feebly impressed before the basal margin at the middle; elytra much wider than long, the suture distinctly longer than the prothorax, similarly punctate; abdomen parallel, with broadly arcuate sides, narrower than the elytra, finely and plentifully though not densely punctate, the fifth tergite slightly longer than the fourth, the sixth (♂) with two tuberculiform teeth separated by a feeble sinus at the middle of the apex and mutually a little more distant than either from the slender, internally concave lateral projection; mesosternal process becoming moderately narrow but not aciculate, its strongly rounded apex extending to apical third of the separated coxæ and considerably distant from the very short and broadly rounded metasternum; basal joint of the hind tarsi shorter than the second, two to four equal. Length 2.3-2.6 mm.; width 0.63-0.7 mm. Arizona (Tuçson). |
Somewhat allied to weedi but differing in the sterna, cephalic carinæ and sexual characters; the mesosternal process is not so wide but is to aciculate, as it generally is in typical Atheta.
| Atheta umbonalis n. sp.—Rather stout, moderately convex, black, the elytra dark rufo-piceous, the legs pale; antennæ blackish, the two basal joints pale; body not very shining, strongly micro-reticulate, the abdomen more coarsely but feebly so and shining; punctures asperulate and rather close-set, sparser on the head, very fine and spare on the abdomen; head moderate, the eyes at barely their own length from the base, the carinæ wholly wanting; antennæ thick but only feebly incrassate, the outer joints distinctly transverse, the eleventh rather longer than the two preceding, the second and third equal; prothorax convex, rather strongly transverse, much wider than the head and distinctly narrower than the elytra, the sides parallel, subevenly rounded, the basal angles distinct and only slightly blunt; surface unimpressed; elytra parallel, much wider than long, much longer |
