Chaetocnema (Chaetocnema) nagpurensis Duvivier, 1892

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 : 79

27. Chaetocnema (Chaetocnema) nagpurensis Duvivier, 1892

Chaetocnema nagpurensis Duvivier, 1892: 422 . TL: Bihar, India. TD: Unknown.

Distribution: Bihar, India.

Host plants: Unknown.

Description (after Duvivier, 1892): Body length: approximately 2 mm. Subovate, moderately convex. Black, with head, prothorax and elytra bronzy, antennae and legs light brown, posterior femora bronzy-black, anterior and intermediate femora marked with pitch black. Head finely rugulose and finely punctate, without frontal carina, with a small depression between eyes, and frons large and declivous. Prothorax about one and a half times broader than long, transversely convex, with anterior lateral angles placed in a lower plane, sides almost straight; surface rugulose, somewhat closely, very finely and uniformly punctate; along the basal margin is an uninterrupted series of strong and deep punctures. Elytra somewhat broader at base than prothorax, with humeral calli moderately prominent; strongly punctate-striate, interstices subconvex, densely punctate and transversely wrinkled, area surrounding scutellum very gently convex.

Remarks: Chaetocnema nagpurensis is close to C. trapezoida sp. nov., while they differ mainly in coloration. C. nagpurensis is somewhat darker, with head, prothorax and elytra bronzy, while C. trapezoida is obviously metallic green. Interspaces between puncture rows of elytra are densely punctate and transversely wrinkled in C. nagpurensis , while it is finely punctate and not wrinkled (or only slightly wrinkled in peri-scutellar area) in C. trapezoida sp. nov.

There are several other Oriental Chaetocnema species with transverse wrinkles on interspaces of puncture rows of elytra: C. fusiformis , C. gracilis , C. hainanensis . However, none of them have a row of large punctures along base of the pronotum.