Adiscus inornatus Chen & Pu, 1980

Duan, Wen-Yuan & Zhou, Hong-Zhang, 2022, Revision of the genus Adiscus Gistel, 1857 (Coleoptera: Chrysomelidae, Cryptocephalinae) from mainland China, Zootaxa 5096 (1), pp. 1-80 : 42-43

Adiscus inornatus Chen & Pu, 1980

(Figs 17-1; 17-2)

Adiscus inornatus Chen & Pu, 1980: 111 (type locality: Yunnan; type deposited: IZ-CAS); Schöller et al., 2010: 607 (catalogue).

Material examined. CHINA: Holotype: female, “ Yunnan: Xishuangbanna Menghun [Chinese letters] / 1200– 1400 m / Chinese Academy of Sciences [ Chinese letters] // 28. V. 1958 / coll. Shuyong Wang [Chinese letters] // HOLOTYPE ”. ( IZ-CAS).

Redescription. Measurements. Female. BL = 2.86 mm, BW = 2.15 mm, HL = 1.02 mm, HW = 0.76 mm, PL = 0.87 mm, PW = 1.89 mm, PA = 105°, EL = 2.34 mm, EA = 130°.

Body (Figs. 17-1A; 17-2A) small and ovate; dorsum shiny. Head reddish brown; antennomeres 1–5 yellow, 6–11 darkish brown. Pronotum reddish brown, basal margin black. Elytra orange, without black markings. Venter yellowish brown.

Head dull; distinctly and coarsely punctate. Eyes reniform, emarginated below middle; superior eye-lobes separated about equally as antennal insertions. Antennae short, reaching basal region of elytra, scape long, pedicel short and round, antennomeres 3 and 4 minute, shorter than pedicel, 6–11 somewhat broadened and flattened, about equal in length and broad.

Pronotum (Figs. 17-1A; 17-2A) convex, smooth and shiny, base much broader than apex, basal width about twice pronotal length. Anterior margin nearly straight. Posterior margin finely sinuate with fine serration, and produced into an obtuse angle of about 105° at middle. Disc evenly convex, fine and coarse punctures.

Elytra (Figs. 17-1A; 17-2A) as broad as long, humeri somewhat prominent, shiny. Disc distinctly and evenly punctate, with 11 regular striae, intervals without any minute punctures. Epipleural lobe (Fig. 17-2B) large, lateral margin distinctly expanded ventrally with rounded lobe at basal 1/2 of erytron, with both lobe sides forming angle of 130°, epipleura visible in lateral view.

Venter clothed with sparsely short pubescence. Prosternum (Fig. 17-2C) trapezoidal, lateral ridge slightly prominent, bifurcate, posterior margin nearly straight. Mesoventrite broad, about 2.7 times as wide as long. Pygidium with dense and coarse punctures

Distribution. China (Yunnan).

Diagnosis. This species is similar to A. tibialis , but distinguished by the coloration of body, lacking black spots. Its pronotum is broad and the lateral ridge of prosternum less bifurcate.