Chaetocnema (Udorpes) cupreata Chen, 1934

Ruan, Yongying, Yang, Xingke, Konstantinov, Alexander S., Prathapan, Kaniyarikkal D. & Zhang, Mengna, 2019, Revision of the Oriental Chaetocnema species (Coleoptera, Chrysomelidae, Galerucinae, Alticini), Zootaxa 4699 (1), pp. 1-206 : 151

61. Chaetocnema (Udorpes) cupreata Chen, 1934

Chaetocnema cupreata Chen, 1934: 245 , 249. TL: Tonkin, Vietnam. TD: MNHN.

Distribution: Vietnam ( Tonkin).

Host plants: Unknown.

Description (after Chen, 1934): Body length: about 3.5 mm. Dorsum cupreous, resembles C. concinnicollis in color, but with the body longer. Antennae with four or five basal antennomeres fulvous, rest darker. Legs red brown, anterior femora slightly and posterior deeply metallic.

Head hypognathous. Frontal ridge flat and wide. Frontolateral sulcus absent. Vertex finely reticulate, strongly and rather closely punctate, but with a longitudinal median impunctate area; clypeus closely punctate and setose. Antennae extending to a little distance beyond humeral calli, second joint slightly shorter than third, 3–6 subequal in length, rest slightly and progressively shortened and thickened towards apex.

Pronotum without short longitudinal impressions near basal margin. Deep row of large punctures at base of pronotum absent. Pronotal base evenly convex. Pronotum rather convex in front, closely punctate; lateral margins almost straight behind, convergent in front; base somewhat rounded in middle.

Elytra slightly broader at base than prothorax, transversely depressed behind basal portion and strongly punctate; each elytron with eleven rows of punctures, short scutellar row geminate; interstices extremely finely granulose when seen under high magnification, lateral interstices costate. Humeral callus well developed.

Material: We have tried several times, however, we could not find the type in MNHN. No material was examined.

Remarks: This species closely resembles C. merguiensis , and can be differentiated from the latter by the shorter antennae and color (dorsum cupreous in C. cupreata while metallic green in C. merguiensis ).