Maladera chinensis (Moser, 1915) Fabrizi & Liu & Bai & Yang & Ahrens, 2021

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), Zootaxa 4922 (1), pp. 1-400 : 267-268

Maladera chinensis (Moser, 1915) comb. n.

Figures 62 J–M, 121

Serica chinensis Moser, 1915c: 144 .

Nipponoserica chinensis: Nomura 1973: 139 ; Ahrens 2006b: 240, 2007b: 28.

Type material examined. Syntypes: 1 ♂ “ China Tsingtau / Serica chinensis Type Mos./ Typus ” ( ZMHB) , 1 ♀ “ China Tsingtau / S. chinensis Moser ” ( ZMHB) .

Additional material examined. 1 ♂ “ China, 17.-22.VI. Shaanxi prov. 1991 Hue Shan peak env. 100Km E of Xian Z. Kejval lgt.” ( CP) , 2 ♂ “ China-Shaanxi Hunyuan 16.7.- 18.7.2000 leg. E. Kucera ” ( CP, ZFMK) , 1 ♂, 1 ♀ “ Mt. Xiangshan , Beijing, 27.VII.1964 ” ( IZAS), 1 ♂ “ North hill, Mt. Xiaowutai , Hebei, 18.VIII.1964, 1200-1600m, leg. Han Yinheng ” ( IZAS) .

Redescription. Length: 6.6 mm, length of elytra: 4.6 mm, width: 4.0 mm. Body oblong, dark reddish brown, dull, legs brown, antenna yellow, glabrous.

Labroclypeus wide, trapezoidal, lateral margins convex and strongly convergent, producing an indistinct angle with ocular canthus; anterior angles strongly rounded; anterior margin weakly emarginate medially, margins weakly reflexed; surface weakly shiny, flat, finely and densely punctate, with a few erect setae; frontoclypeal suture indistinct, curved; ocular canthus short and narrow (1/3 of ocular width), finely and densely punctate, with a short terminal seta. Frons dull, with fine, dense punctures and a few erect setae beside eyes. Antenna with ten antennomeres, club with three antennomeres, little shorter than remaining antennomeres combined. Eyes very small, ratio diameter/ interocular width: 0.38. Mentum convexly elevated and flattened anteriorly.

Pronotum widest at base, lateral margins weakly convex and convergent anteriorly; anterior angles sharp and distinctly produced, posterior angles blunt; anterior margin weakly convex, marginal line widely interrupted medially; basal margin without marginal line; surface coarsely and densely punctate, punctures with microscopic setae only, lateral and anterior margins sparsely setose. Hypomeron carinate but not produced ventrally. Scutellum wide, triangular, punctation as on pronotum.

Elytra narrow, widest in posterior third, striae distinctly impressed, finely punctate, intervals weakly convex, finely and densely punctate, punctures concentrated along striae, with minute setae in punctures, otherwise glabrous; epipleural margin robust, 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, only metasternal plate and lateral metacoxa with a few long or robust setae. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/ metacoxa: 1/ 1.45. Abdominal sternites finely and moderately densely punctate, each with a row of coarse punctures bearing each a robust seta. Pygidium moderately convex, coarsely and densely punctate, with a few long setae in apical half.

Legs moderately long and narrow, shiny; femora finely and sparsely punctate, with two longitudinal rows of setae. Metafemur with anterior margin acute, without adjacent serrated line; posterior ventral margin almost straight, weakly widened and serrated in apical half, dorsal posterior margin completely finely serrated, sparsely setose. Metatibia moderately long and wide, ratio width/ length: 1/ 3.4, sharply carinate dorsally, with two groups of spines, basal one at one third, apical one at three quarter of metatibial length, basally with a few short setae in line; lateral face longitudinally convex, finely and moderately densely punctate; apex concavely emarginate interiorly near tarsal articulation. Tarsomeres impunctate dorsally, with moderately dense, fine setae ventrally; metatarsomeres ventrally with a strongly serrated carina, subventrally with a second, smooth longitudinal carina; first metatarsomere slightly shorter than following two tarsomeres combined and little longer than dorsal tibial spur. Protibia moderately long, bidentate; anterior claws symmetric, interior tarsal claws sharply pointed.

Aedeagus: Fig. 62 J–L. Habitus: 62M.

Distribution. See map ( Fig. 121 ) and Table 1.

Figures

FIGURE 62. A–E: Maladera guanxiensis Ahrens, Fabrizi & Liu, sp. n. (holotype); F–I: M. pieli Ahrens, Fabrizi & Liu, sp. n. (holotype); J–M: M. chinensis (Moser, 1915) (China: Shaanxi: Hunyuan). A, F, J: aedeagus, left side lateral view; D, H, L: aedeagus, right side lateral view; C: aedeagus, dorsal view; B, G, K: parameres, dorsal view; E, I, M: habitus. Scale: 0.5 mm. Habitus not to scale.

FIGURE 121. Distribution of the Maladera uncipenis group: Maladera baii sp. n., M. bawanglingana sp. n., M. beidouensis sp. n., M. chinensis (Moser, 1915), M. dadongshanica sp. n., M. dayaoshanica sp. n., M. emeifengensis sp. n., M. excisilabrata sp. n..