Adiscus lushuiensis Tan, 1992

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 : 47-48

Adiscus lushuiensis Tan, 1992

(Figs 19-1; 19-2)

Adiscus lushuiensis Tan, 1992b: 782 (type locality: Lushui, Yunnan; type locality: IZ-CAS); Schöller et al., 2010: 608 (catalogue).

Material examined. CHINA: Holotype: female, “ Yunnan: Lushui, Pianma [ Chinese letters] / 800 m / Chinese Academy of Sciences [ Chinese letters] // 31. V. 1981 // HOLOTYPE ”. ( IZ-CAS) ; Additional material: 2 females, same data as holotype, ( IZ-CAS) .

Redescription. Measurements. Females. BL = 3.58–3.96 mm, BW = 2.54–2.89 mm, HL = 1.11 mm, HW = 1.09 mm, PL = 0.93 mm, PW = 2.28 mm, PA = 90°, EL = 3.07 mm, EA = 140°, SL = 0.37 mm.

Body (Figs. 19-1A; 19-2A) short ovate, subquadrate; dorsum shiny, mostly yellowish brown. Head black; antennomeres 1–6 reddish brown, 7–11 darkish brown; clypeus and labrum reddish brown. Pronotum reddish brown; with broad transverse black band along anterior margin and a narrowly black stripe along lateral margin; sometimes anterior black band posteriorly expanded at middle and sides, and posterior margin somewhat tinged with black. Elytra reddish brown, with a dark purple margins, except median suture. Legs yellow-brown. Venter black, partly tinged with reddish brown.

Head smooth and shiny, finely and weakly punctate. Eyes reniform; superior eye-lobes separated by slightly greater distance than antennal insertions. Clypeus anterior margin slightly emarginated apically. Antennae long, reaching middle basal 1/3 of elytra, antennomeres 1–5 with indistinct hairs, 6–11 pubescent, scape swollen, clubbed, pedicel oblong, about half as long as scape, antennomeres 3–5 slender, cylindrical, about as long as pedicel, 6–11 somewhat broadened and flattened, last segment pointed apically.

Pronotum (Figs. 19-1A; 19-2A) convex, smooth and shiny, base much broader than apex, basal width about 2.5 times pronotal length. Anterior and hind angles nearly90°. Lateral margin nearly straight. Posterior margin undulated, its middle portion produced into a right-angle of about 90°. Disc evenly convex, impunctate.

Elytra (Figs. 19-1A; 19-2A) as broad as long, about as broad as pronotum at base; humeri somewhat prominent. Disc weakly and finely punctate, with 11 regular striae, intervals without minute punctures. Epipleural lobe (Fig. 19-2B) large, lateral margins distinctly expanded ventrally with rounded lobe at basal 1/2 of elytron, with both lobe sides forming angle of 140°, epipleura obliquely placed and visible in lateral view.

Venter clothed with short pubescence. Prosternal episternum finely rugose; prosternum trapezoidal, lateral margin slightly protruding, posterior margin a little concave, hind angles weakly subtriangular. Mesoventrite broad, about 3.3 times as wide as long. Pygidium with densely fine punctures and pubescence.

Female. Body more robust than male, apical hollow in ventrite 5 deep and triangular. Spermatheca (Fig. 19- 2D) falcate, 80°-angled from apical 2/3, acute at apex; duct weakly sclerotized, irregularly coiling 4–5 times; Rectal sclerites (Fig. 19-1C) strongly sclerotized, not connected between two rectangular sclerites on ventral side.

Distribution. China (Yunnan).

Diagnosis. This species is similar to A. humeralis , but the pronotum is smooth and impunctate, and the color of elytra different.