Adiscus nigripennis ( Jacoby, 1890 )

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 : 58-61

Adiscus nigripennis ( Jacoby, 1890)

(Figs 24-1; 24-2)

Dioryctus nigripennis Jacoby, 1890: 89 (type locality: Chang-yang; type deposited: MCZ).

Adiscus nigripennis: Gressitt & Kimoto, 1961: 119 (Chekiang, Fukien) ; Kimoto, 1964: 142 (Ryukyus); Tan et al. 1980: 169; Kimoto & Gressitt, 1981: 325; Medvedev, 1992b: 385 ( India); Schöller et al., 2010: 608 (catalogue).

= Dioryctus major Pic, 1926a: 12 (type locality: Tonkin; type deposited: MNHN).

= Adiscus major: Gressitt & Kimoto, 1961: 119 (as synonym of Adiscus nigripennis ).

= Falsodioryctus sinensis Pic, 1955: 21 (type locality: Kuatun; type deposited: NHRS).

= Adiscus sinensis: Gressitt & Kimoto, 1961: 119 (as synonym of Adiscus nigripennis ).

Material examined. CHINA: Zhejiang Province: 1 female, Mt. Mogan [Moganshan], 7. VI. 1935, coll. Unknown ( IZ-CAS) ; 2 females, Mt. Tianmu Peak , 26. VI. 1957, coll. Jikun Yang ( IZ-CAS) ; Fujian Province: 2 females, Chong’an, Xing Village, Sangang , 16. V. 1960, coll. Fuji Pu ( IZ-CAS) ; 2 females, Chong’an, Xing Village, Sangang , 17. V. 1960, coll. Shengqiao Jiang ( IZ-CAS) ; 1 female, Chong’an, Xing Village, Sangang , 25. V. 1960, coll. Chenglin Ma ( IZ-CAS) ; 1 male, Chong’an, Xing Village, Sangang , 29. V. 1960, coll. Shengqiao Jiang ( IZ-CAS) ; 1 male, Chong’an, Xing Village, Longdu , 21. V. 1960, coll. Yiran Zhang ( IZ-CAS) ; 1 female, Chong’an, Xing Village, Guadun , 11. V. 1960, coll. Fuji Pu ( IZ-CAS) ; 1 female, Chong’an, Xing Village, Guadun , 2. V. 1960, coll. Shengqiao Jiang ( IZ-CAS) ; 3 females, Chong’an, Xing Village, Guadun , 12. VI. 1960, coll. Shengqiao Jiang ( IZ-CAS) ; 1 female, Chong’an, Xing Village, Guadun , 2. VII. 1960, coll. Fuji Pu ( IZ-CAS) ; 1 female, Chong’an, Xing Village, Qili Bridge [Qiliqiao], 1. VI. 1960, coll. Shengqiao Jiang ( IZ-CAS) ; 1 female, Chong’an, Xing Village, Tongmuguan , 28. VI. 1960, coll. Shengqiao Jiang ( IZ-CAS) ; 1 male, 1 female, Jianyang, Huangkeng Chutou , 23. IV. 1960, coll. Yong Zuo ( IZ-CAS) ; 1 male, Jianyang, Huangkeng Chutou , 23. IV. 1960, coll. Yiran Zhang ( IZ-CAS) ; 1 male, Jianyang, Huangkeng Chutou , 26. IV. 1960, coll. Yiran Zhang ( IZ-CAS) ; 1 female, Jianyang Huangkeng, Chutou , 30. IV. 1960, coll. Fuji Pu ( IZ-CAS) ; 1 male, Jianyang, Huangkeng, Dazhulan , 2. V. 1960, coll. Fuji Pu ( IZ-CAS) ; 1 female, Jianyang, Huangkeng, Dazhulan , 2. V. 1960, coll. Yong Zuo ( IZ-CAS) ; 1 female, Jianyang, Huangkeng, Dazhulan , 2. V. 1960, coll. Yiran Zhang ( IZ-CAS) ; 2 females, Jianyang, Huangkeng, Dazhulan , 28. V. 1960, coll. Yiran Zhang ( IZ-CAS) ; 1 female, Jianyang, Huangkeng, Dazhulan , 28. V. 1960, coll. Shengqiao Jiang ; 2 females, Jianyang, Huangkeng, Guilin , 11. IV. 1960, coll. Yiran Zhang ( IZ-CAS) ; 1 female, Jianyang, Huangkeng, Lijiatang , 7. V. 1960, coll. Yong Zuo ( IZ-CAS) ; 1 female, Jianyang, Dehua, Dongli , 7. VI. 1960, coll. Fuji Pu ( IZ-CAS) ; 1 female, Jianyang, Dehua, Dongli , 7. VI. 1960, coll. Fuji Pu ( IZ-CAS) ; 1 female, Jianyang, Dehua, Dongli , Mt. Xiaodaiyun [Xiaodaiyunshan], 6. VI. 1960, coll. Fuji Pu ( IZ-CAS) ; Guizhou Province: 1 female, Guizhu, Qingyan , 25. V. 1951, coll. Xianhua Chen ( IZ-CAS) .

Redescription. Measurements. Males. BL = 4.36–4.82 mm, BW = 3.04–3.45 mm, HL = 1.61 mm, HW = 1.35 mm, PL = 1.41 mm, PW = 2.94 mm, PA = 110°, EL = 3.54 mm, EA = 150°, AL = 1.53 mm, AW = 0.49 mm.

Females. BL = 4.68–5.04 mm, BW = 3.23–3.65 mm, HL = 1.74 mm, HW = 1.47 mm, PL = 1.53 mm, PW = 3.18 mm, PA = 110°, EL = 3.84 mm, EA = 150°, SL = 0.66 mm.

Body (Figs. 24-1A; 24-2A) ovate, subquadrate. Head orange to fuscous; apex of mandibles black; antennomeres 1–5 orange, 6–11 darkish brown. Pronotum orange, sometimes black tinged reddish brown, basal margin black. Elytra metallic black. The venter of prothorax and mesothorax yellowish brown, lateral margin of mesoventrite tinged black; metathorax largely yellowish brown, metaventrite tinged black.Abdomen largely black, sides yellowish brown. Legs yellowish brown.

Head dull, finely and sparsely punctate. Eyes reniform; broadly emarginated; superior eye-lobes separated by greater distance than antennal insertions. Clypeus densely granulose and sparsely and coarsely punctate. Frons with dense fine punctures. Vertex with sparser punctures than on frons, intervals with scattered minute punctures. Antennae reaching area behind humeri of elytra, scape thick, clubbed, pedicel spherical, antennomeres 3–5 slender, 4 longer than 3, 5 broader, 6–11 somewhat broadened and flattened, 10 elongate; the last segment pointed apically.

Pronotum (Figs. 24-1A; 24-2A) broad, base much broader than apex, basal width about 2.1 times of pronotal length. Anterior margin nearly straight. Posterior margin finely sinuate with fine serration, and produced into an obtuse angle of 110° at middle. Disc evenly convex, shiny, finely punctate.

Elytra (Figs. 24-1A; 24-2A) subquadrate, as broad as pronotum at base, humeri strongly prominent, and posterior region not convex. Disc punctate, with 11 regular striae, intervals with scattered minute punctures, puncture striae irregular on apical slope. Epipleural lobe (Fig. 24-2B) large, lateral margins distinctly expanded ventrally and with lobe at basal 1/2 of elytron, with both lobe sides forming angle of 150°, epipleura obliquely placed and visible in lateral view.

Venter clothed with sparse pubescence and dense fine punctures. Prosternum (Fig. 24-2C) broad, with media longitudinal raising in anterior half; lateral margin elevated to ridge, straight in lateral view, posterior margin with sharp angles on both sides, middle area with a prominent obtuse angle. Mesoventrite about 1.7 times as wide as long, lateral margin slightly protruding, posterior margin with weakly acute angles on both sides. Pygidium with dense coarse punctures.

Aedeagus. (Figs. 24-1D–F; 24-2D–F) Median lobe elongate, about twice as long as wide, nearly clubbed. Apex of median lobe slightly narrower than middle, acute at apex, moderately curved in lateral view; with several setae on each side of apex, apex acutely protuberant with indistinct and sparse punctures on ventral side of distal part. Median orifice with median sclerite bending inwards above surface. Inner sac slightly broad, cylindrical, dilated at middle part nearly quadrate, but bilobed and acute at apex. Tegmen Y-shaped, weakly sclerotized, almost translucent.

Female. Body more robust than male, apical hollow in ventrite 5 deep and round. Spermatheca (Figs. 24-1C; 24-2G) falcate, 70°-angled bending from apex 3/5, slightly acute at apex, dilated at base 1/5, then narrower, duct weakly sclerotized, strongly and irregularly coiling 7–8 times. Rectal sclerites (Fig. 24-1G) weakly sclerotized, sclerite narrow, not connected between two rectangular sclerites on ventral side.

Distribution. China (Zhejiang, Fujian, Hubei, Guizhou); India; Japan; Vietnam.