Metachroma montanense Blake 1970

Metachroma montanense

DESCRIPTION.—Length, 3.0 mm; narrowly oblong oval, shining, pale yellow-brown with head, prothorax, and apical joints of antennae deeper reddish brown; prothorax densely but not coarsely punctate, elytra with regular rows of striate punctures becoming less distinct towards apex.

Head with interocular space a little more than half width of head, a faint, short orbital groove above antennal sockets, eyes appearing entire and not emarginate; surface smooth, shining, without depressions or transverse sulcus, finely and shallowly punctate, slightly coarser on clypeus, anterior margin over labrum nearly straight, mouthparts dark. Antennae extending below humeri, outer joints deeper brown and wider. Prothorax nearly as long as wide, strongly convex with slightly rounded sides, with a small tooth at each angle, densely punctate, punctures somewhat coarser near lateral margin, a short impunctate median line, shining reddish brown. Scutellum reddish brown. Elytra a little over twice as long as prothorax, convex, with only a short, intrahumeral sulcus, no other depressions, striate punctures regular, on sides with a tendency to being deeply impressed, with intervals somewhat costate, and with many confused punctures, entirely yellowish brown. Body beneath yellowish brown. Length, 3 mm; width, 1.6 mm.

TYPE.—Female, USNM 70688 (from Chittenden collection).

TYPE-LOCALITY.—Montana.