Adiscus occipitalis 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 : 61-63

Adiscus occipitalis Chen & Pu, 1980

(Figs 25-1; 25-2)

Adiscus occipitalis Chen & Pu, 1980: 109 (type locality: Fujian; type deposited: IZ-CAS); Schöller et al., 2010: 608 (catalogue).

Material examined. CHINA: Holotype: female, “ Fujian: Jianyang, Julin [ Chinese letters] / 350–460 m / Chinese Academy of Sciences [ Chinese letters] // 28. III. 1960 / coll. Yiran Zhang [Chinese letters] // HOLOTYPE ”. ( IZ-CAS).

Redescription. Measurements. Female. BL = 2.23–2.61 mm, BW = 1.62–1.97 mm, HL = 0.85 mm, HW = 0.87 mm, PL = 0.74 mm, PW = 1.37 mm, PA = 80°, EL = 1.85 mm, EA = 160°.

Body (Figs. 25-1A; 25-2A) nearly round, dorsum convex, mostly yellowish brown. Upper portion of head somewhat alutaceous, posterior yellowish brown. Antennomeres 1–5 yellow, 6–11 fuscous. Pronotum pale reddish brown, with basal margin black. Elytra yellowish brown, with transverse black bilobed band at base, not extending to lateral margin or suture, and two large subquadrate spots at middle and near lateral margin of each. Venter yellowish brown.

Head dull, finely and sparsely punctate. Eyes slightly emarginated below middle; superior eye-lobes separated by greater distance than antennal insertions. Antennae moderately short, reaching elytral humeri, scape clubbed, pedicel oblong, antennomeres 3 and 4 slenderest, longer than pedicel, 5–10 somewhat dilated apically.

Pronotum (Figs. 25-1A; 25-2A) convex, smooth and shiny, much broader basely than apically, basal width about 1.9 times of pronotal length. Anterior margin nearly straight. Posterior margin sinuate with fine serration, and produced into an acute angle of 80° at middle. Disc evenly convex, impunctate. Anterior and hind angles about 90°.

Elytra (Figs. 25-1A; 25-2A) as broad as long, humeri somewhat prominent, glabrous. Disc sparsely and finely punctate, with 11 regular striae, intervals with scattered minute punctures, puncture striae irregular on apical slope. Epipleural lobe (Fig. 25-2B) weak, lateral margins slightly expanded ventrally and with arched lobe at basal 1/4 of elytron, with both sides forming angle of 160°, epipleura invisible in lateral view.

Venter clothed with short pubescence. Prosternum (Fig. 25-2C) trapezoidal, anterior margin not protruding, lateral ridges weakly elevated. Mesoventrite broad, about 2.7 times as wide as long. Pygidium with indistinct punctures.

Genitalia not examined.

Distribution. China (Fujian).

Diagnosis. This species is similar to A. variabilis , but can be distinguished by the different coloration and coarser punctures on elytra, the sparse and minute punctures on pronotum, the widely separated superior eye-lobes and the terminal five segments of antennae almost moniliform.