Adiscus atripennis 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 : 18-20

Adiscus atripennis Chen & Pu, 1980

(Figs. 6-1; 6-2)

Adiscus atripennis Chen & Pu, 1980: 109 (type locality: Fujian; type deposited: IZ-CAS); Schöller et al., 2010: 607 (catalogue).

Material examined. CHINA: Holotype: female, “ Fujian: Chong’ an, Xingcun, Sangang [ Chinese letters] / 800 m / Chinese Academy of Sciences [ Chinese letters] // 20.V. 1960 / coll. Shengqiao Jiang [Chinese letters] // HOLOTYPE ” ( IZ-CAS) . Paratype: 1 female, “ Fujian: Chong’ an, Xingcun, Sangang [ Chinese letters] / 720 m / Chinese Academy of Sciences [ Chinese letters] // 14. V. 1960 / coll. Shengqiao Jiang [Chinese letters] // PARATYPE ” ( IZ-CAS) .

Redescription. Measurements. Females. BL = 2.26–2.82 mm, BW = 1.65–1.74 mm, HL = 0.97 mm, HW = 0.92 mm, PL = 0.74 mm, PW = 1.55 mm, PA = 110°, EL = 2.19 mm, EA = 160°.

Body (Figs. 6-1A; 6-2A) small and ovate, dorsum shiny. Head reddish brown. Antennae yellowish brown, mandibles darkish brown. Pronotum orange, basal margin black. Elytra black. Legs largely reddish brown. Venter darkish brown.

Head shinywith fine and dense punctures, coarser than those on pronotum. Eyes reniform, slightly emarginated below middle; superior eye-lobes separated by moderately greater distance than antennal insertions. Clypeus sparsely punctate, anterior margin arched and slightly emarginated. Labrum with sparse short setae.Antennae short with long setae, reaching area base of elytra, scape clubbed, pedicel oblong, about half as long as scape, antennomeres 3–5 minute, each segment about equal in length, 6–11 somewhat broadened and flattened, last segment slightly acute apically.

Pronotum (Figs. 6-1A; 6-2A) convex and smooth, much broader basely than apically, width twice pronotal length. Anterior margin nearly straight. Posterior margin sinuate with fine serration, produced into an obtuse angle of about 110° at middle. Anterior and posterior angles nearly right-angled. Disc evenly convex, punctures fine and weak, indistinct.

Elytra (Figs. 6-1A; 6-2A) with humeri prominent and glabrous. Disc sparsely and finely punctate, with 11 regular striae, intervals with scattered minute punctures. Lateral margins distinctly raised, epipleural lobe feeble (Fig. 6-2B), weakly arcuate, forming a rounded angle of about 160°, epipleura obliquely placed and visible in lateral view.

Venter clothed with pubescence. Prosternum (Fig. 6-2C) trapezoidal, anterior margin longer than posterior one, anterior margin not protruding, posterior margin slightly concave, lateral ridge weakly elevated, straight in lateral view. Mesoventrite twice as wide as long, posterior margin slightly concave. Pygidium with dense punctures and short pubescence.

Female. Body robust. Spermatheca (Fig. 6-2D) falcate, 45°-angled bending halfway, acute at the apex; duct base thickened strongly, coiled, then becoming thinner, and coiled about 5–6 times. Rectal sclerites (Fig. 6-1C) strongly sclerotized, two sclerites oblong, nearly connected in ventral view.

Distribution. China (Fujian).

Diagnosis. This species is similar to A. variabilis but the main difference is that the punctures on elytra are coarser, the interstriae are covered with obvious but feeble punctures, especially on the disc, and the terminal segments of antennae are brown, not smoky colored, and thick, with each segment as broad as long.