Maladera gibbiventris (Brenske, 1897) Figures 48 E–H, 113 Autoserica gibbiventris Brenske, 1897: 396; Niijima & Kinoshita 1927: 9. Aserica gibbiventris: Murayama 1938: 12. Serica gibbiventris: Murayama 1954: 36. Maladera gibbiventris: Nomura 1974: 109; Stebnicka 1980: 254; Kim & Lee 1997: 126; Ahrens 2002: 84; 2006b: 237, 2007b: 23; Kim & Kim 2003: 87. Type material examined. Lectotype (here designated): ♂ “Chang Yang, near Ichang, 6-8000 ft. June 88./ ♂ / Syntypus/ gibbiventris Typ. Brsk. / Coll. Kraatz ” (DEIC). Paralectotypes (here designated): 1 ♂ “Chang Yang, near Ichang, 4-6000 ft., V. VII. VIII./ ♂ / gibbiventris cotyp. Brsk./ Coll. Brenske ” (ZMHB), 3 ♀♀ “Chang Yang, near Ichang, 4-6000 ft., V. VII. VIII./ gibbiventris/ Coll. Brenske ” (ZMHB). Additional material examined. China: 1 ♂ “ Longmenhe, Xingshan, Hubei, 7.V.1994, 1300m, leg. Li Wenzhu ” (IZAS), 1 ♂ “ Mokanshan, 22.V.1935 ” (IZAS), 2 ♂♂ “ Longmenhe, Xingshan, Hubei, 7,11. V. 1994, 700m, 1300m, leg. Yang Xingke, Yao Jian Li Wenzhu ” (IZAS), 24 ex. “ China, Hunan, Jiucai Ling 25°32’N 111°22’E, 1300m, VII.2006, leg. Viktor & Sveta Siniaev ” (ZFMK), 14 ex. “ China: Hunan, Jiucai Ling 25°32’N 111°22’E, IV.2006, H~ 1300m, leg. V. Siniaev ” (ZFMK), 2 ex. “ China: Fujian Province, Mt. Liangshan-ding, Wuping County, July 2- 13, 2009 local collectors Ankauf via Li Jingke 2010” (ZFMK), 2 ex. “ China: Hunan; Mupu Mt., 1600m, Pingjiang, VIII_2003, leg. Li et al. ” (ZFMK), 2 ex. “China, NE Jiangxi, 18.IV. Sanqingshan, 450-600m, 28°52’N 118°04’E Jaroslav Turna leg., 2006” (ZFMK), 1 ex. “ China, N Fujian, 20.IV. Da’an, NW env., 428m 27°53’N 117°53’E Jaroslav Turna leg., 2006” (ZFMK), 1 ♂ “ China-Guizhoiu 21-26.V. 60km N of Kaili, 1995 Shibing-Yuntai Shan E. Jendek & O. Šauša leg./ Coll. P. Pacholatko Invt. No. / CS30/ 564 Sericini Asia spec.” (CP), 2 ♂♂ “ China—Shaanxi, Daba Shan, Shou Man vill., 32°14’N, 108°34’E, 25.v.-14.vi.2000, 1000m, Siniaev & Plutenko leg.” (CP), 3 ♂♂ “ China: Zhejiang Prov. Qinqliangfeng Qianqingfang 30°18’N, 119°07’E alt. 1000-1100m 16-V-2012 Chen, Ma & Zhao leg.” (SNUC), 1 ♂ “X-DA2973 China: Guangdong Prov., W of Qixing, Heishiding nature reserve, 190m 23°27,9’N, 111°54,3’E 1.-3.v.2011 M. Fikáček & J. Hájek Maladera spCHz1@” (ZFMK). North Korea: 2 ex. “ Siniju N. Korea 18.IV.1994 Lee J. Kha” (ZFMK). South Korea: 1 ex. (♂) “ Seoul Korea/ Collectio Coleopterorum Johan Albert Hultgren” (MZLU), 2 ex. “ 16.06.2010 Hongik Univ., Seoul (S̹dkorea) leg. T. Kölkebeck ” (ZFMK), 1 ex. “ 22.06.2010 Hongik Univ., Seoul (Südkorea) leg. T. Kölkebeck ” (ZFMK), 2 ♂♂, 9 ♀♀ “ Soul Korea” (ZMHB), 2 ♀♀ “ Korea ” (ZMHB). Redescription. Length: 10.0 mm, length of elytra: 7.6 mm, width: 5.5 mm. Body wide-oval, dark brown, antenna yellowish brown, dorsal surface dull, labroclypeus, tarsomeres, and tibiae shiny, glabrous. Labroclypeus moderately wide, lateral margins weakly convex and moderately convergent, lateral margins produce with ocular canthus an indistinct blunt angle, anterior angles convex, anterior margin shallowly emarginate medially, margins weakly reflexed; surface shiny, weakly convex, coarsely and densely punctate, distance between punctures smaller their diameter, with a few long, erect setae; smooth area in front of eyes 2.5 times as wide as long; frontoclypeal suture finely incised, bluntly angled medially; ocular canthus moderately wide and short (1/3 of ocular diameter), finely and densely punctate, with a short terminal seta. Frons with fine and moderately dense punctures, with a few single setae beside eyes. Eyes moderately large, ratio diameter/ interocular width: 0.6. Antenna with ten antennomeres, club with three antennomeres and straight, 1.2 times as long as remaining antennomeres combined. Mentum convexly elevated and flattened anteriorly. Pronotum widest at base, lateral margins evenly convex and convergent anteriorly, anterior angles sharp and distinctly produced; anterior margin convex, with fine complete marginal line; basal margin without marginal line; surface finely and densely punctate, punctures with microscopic setae only, setae of lateral and anterior margin sparse. Hypomeron carinate, strongly produced ventrally. Scutellum wide, triangular, punctation as in pronotum. Elytra convex, widest at posterior third, striae finely impressed, finely punctate, intervals weakly convex, finely and densely punctate, punctures concentrated along striae, with minute setae in punctures, odd intervals with a few erect short setae; epipleura ending at strongly rounded external apical angle of elytra, sparsely setose; apex of elytra with a fine membraneous rim of short microtrichomes. Ventral face coarsely and densely punctate, mesosternum densely shortly setose, only metasternal plate with numerous robust setae; metacoxa glabrous, with a few long setae laterally. Distance between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.59. Abdominal sternites finely and moderately densely punctate, each with a row of coarse punctures bearing each a robust seta; fourth sternite at apex widely transversely elevated. Pygidium dull, moderately convex, coarsely and densely punctate, on apical margin with a few long setae. Legs moderately long and wide; femora superficially and sparsely punctate, with two longitudinal rows of setae. Metafemur dull, anterior margin acute, without adjacent serrated line, anterior longitudinal row of setae complete; posterior ventral margin almost straight, not widened in apical half, neither ventrally nor dorsally serrated but smooth, glabrous. Metatibia moderately long and wide, widest shortly before apex, dorsal and ventral margin subparallel, ratio width/length: 1/3.0, sharply carinate dorsally, with two groups of spines, basal one at middle, apical one at four fifths of metatibial length, basally with a few robust and short setae; lateral face weakly longitudinally convex, with fine sparse punctures on basal half and ventral part; medial face impunctate, apex shallowly and concavely emarginate interiorly near tarsal articulation. Tarsomeres impunctate dorsally, with dense, fine setae ventrally; metatarsomeres ventrally glabrous, with a strongly serrated carina, subventrally with a second, smooth longitudinal carina; first metatarsomere little shorter than following two tarsomeres combined, as long as dorsal tibial spur. Protibia short, bidentate. Anterior claws symmetrical. Aedeagus: Fig. 48 E–G. Habitus: Fig. 48H. Remarks. All other syntypes appear to have been lost, therefore the remaining syntype specimen from Chang Yang (DEIC) was chosen as lectotype. Maladera opimai Nomura, 1967, from Iriomote Islands, seems to be very similar, if not identical, to M. gibbiventris, which is also known from Taiwan. Unfortunately, we did not have the chance to examine the holotype of Maladera opimai, thus this question of synonymy can not be resolved here as the drawings presented by Nomura (1967, 1973) are not precise enough for an evaluation. Distribution. See map (Fig. 113) and Table 1.

Published as part of Fabrizi, Silvia, Liu, Wan-Gang, Bai, Ming, Yang, Xing-Ke & Ahrens, Dirk, 2021, A monograph of the genus Maladera Mulsant & Rey, 1871 of China (Coleoptera: Scarabaeidae: Melolonthinae: Sericini), pp. 1-400 in Zootaxa 4922 (1) on pages 211-213, DOI: 10.11646/zootaxa.4922.1.1, http://zenodo.org/record/4496316