Neoserica (s.l.) silvestris Brenske, 1902

Liu, Wan-Gang, Fabrizi, Silvia, Bai, Ming & Ahrens, Dirk, 2016, A taxonomic revision of Neoserica (sensu lato): the species groups N. lubrica, N. obscura, and N. silvestris (Coleoptera, Scarabaeidae, Sericini), ZooKeys 635, pp. 123-160 : 147-149

Neoserica (s.l.) silvestris Brenske, 1902 Figs 4 E–H, 6

Neoserica silvestris Brenske, 1902: 61.

Type material examined.

Syntypes: 2 ♂♂ "Ho-chan/ coll. Thery" (BMNH), 1 ♀ "China Ho-chan/ Serica silvestris typ. Brsk./ coll. Brenske" (ZMHB).

Additional material examined.

CHINA: 1 ex. "China: (Yunnan) Nujiang Lisu Aut. Pref., Nu Shan, 7 km NNW Caojian, 2420m, 25°43'29"N 99°07'57"E (shrubs, litter, moss shifted) 11.VI.2007 leg. D. Wrase/ DA1553" (ZFMK), 4 ex. "China Sichuan Moxi, VI.1993 M. Hackel lgt." (CN), 1 ex. (♀) "China: Sichuan; Moxi; 29.13N 102.10E, 1600m, 2.vii.1998/ 1998 China Expedition J. Farkac, D. Kral, A. Smetana & J. Schneider" (CP), 8 ex. "Sichuan 1950 m Luding, Xin Shing 1.VI.1990 A. Vigna leg." (CS), 1 ex. "Sichuan, Moxi Gongashan Mts. 28.VI.-2.VII.1994 Bolm lgt. 1650 m" (CP), 1 ex. "China, E Hubei, 7-10.V. Dabie Shan, 31.1N 115.8E Wujiashan forest park Jaroslav Turna leg., 2004" (ZFMK), 3 ♂♂ "China: Sichuan; Wolong Reserve, Sigulian Shan, 31°09'N 103°06'E v.2006, 1500-1800m V. Siniaev" (ZFMK), 12 ex. "Yunnan 2900-3500m 27.01N 100.12E 1993 Yulongshan mts. 24-26/5. Vit Kuban leg." (CP), 5 ex. "Yunnan 2200-2500m 24.57N 98.45E 8-16/5 Gaoligong mts. Vit Kuban leg. 1995" (CP), 2 ex. "C-China, Shaanxi, Qinling Shan, 6km E of Xunyangba 1000-1300m, 23.V.-13.VI. Leg. C. Holzschuh 2000" (CP), 6 ex. "C China, W Sichuan, Luding Xian, Moxi, 9-14.vii.1999, V. Benes leg." (CP), 1 ex. "China-Shaanxi, Daba Shan, Shou Man vil., 32°14'N, 108°34'E, 25.v.-14.vi.2000, 1000m, Siniaev & Plutenko leg." (CP), 1 ex. "China: Yunnan prov., Gaoligongshan mts.; 90km W of Baoshan; S. Becvar leg.; 26.-29.v.1995" (CP), 2 ex. "China, 1000-1300m, Shaanxi, Qinling mts., Xunyangba (6km E) 23,v.-13.vi.1998, J.H. Mashal leg. (CP), 1 ex. (♀) "China, Daxue Shan Mts., Sichuan, Gongga Shan Mt., Moxi, 11-13.vii.1999, 1700m, 29°39'N, 102°06'E, V. Siniaev & A. Plutenko lgt." (CP), 1 ex. "China: N-Yunnan Baiyungshan (Bai Railing Mts.) 2400 m Yong Ren, VII-2003 leg. Ying et al." (ZFMK), 1 ♂ "China: Hunan; Mupu Mt. 1600m, Pingjiang VIII-2003, leg. Li et al." (ZFMK), 2 ♀♀ "China West Sichuan Moximian Luding Co. 13.-18.7.94 Benes" (ZFMK), 2 ex. (♀) "Yunnan 2000-3000m 25.11N 100.24E Weibaoshan mts. W slope 25-28/6.92 Vit Kuban leg." (ZFMK), 1 ex. "Den Shiang Uen nr Ningyuenfu/ viii. 9-10-'28 8000-9500ft./ China DC Graham" (USNM), 1 ex. Chengtu 1933/ Szechwan China DC Graham XI-28 alt. 1700ft." (USNM), 1 ex. "Yachow dist. May '28 Coll’r Chen Gih Uen/ Szechuen China DC Graham" (USNM), 1 ex. "Kuanshan Szechwan China DC Graham 19-20-33 alt. 2200-5200ft." (USNM), 1 ♂, 2 ♀♀ "Heilongtan, Kunming, Yunnan, 5.IV.1956, 1900m, leg. Huang Keren etc." (IZAS), 1 ♂ "Heilongtan, Kunming, Yunnan, 5.IV.1956, 1900m, leg. Huang Keren" (IZAS), 1 ♂ "Lomgmenhe, Xingshan, Hubei, 21.VI.1993, 1260m, leg. Li Hongxing" (IZAS), 1 ♂ "Kunming, Yunnan, 7.VI.1955, 1900m, leg. Li Xiwen" (IZAS), 1 ♂ "Menghai, Xishuangbanna, Yunnan, 18.VII.1958, 1200-1600m, leg. Wang Shuyong" (IZAS), 1 ♂ "Institute of Agricultural Sciences, Bijie, Guizhou, leg. Yang, No. 55" (IZAS), 1 ♂ "Botany Garden, Guiyang, Guizhou, 1981" (IZAS), 1 ♂ "Louguantai, Qinling, 30.V.1951" (NWAFU), 1 ♂ "Mt. Taishan, Shangdong, 31.V.1956" (IZAS), 1 ♂ "Xinxing, Luding, Sichuan, 15.VI.1983, 1900m, leg. Chen Yuanqing" (IZAS), 1 ♂ "Yunlong, Yunnan, 20.VI.1981, 2450m, leg. Liao Subai" (IZAS), 1 ♂ "Mts. Lushan, Yiyuan, Shandong, 19.V.2007, leg. Wang Fengyan, Wang Jiliang, Wu Qiqi" (HBUM). MYANMAR: 2 ♂♂ "Myanmar (Burma) Provinz Kachin State Kanphat/ Grenze zu China 24.V.2006 leg. Michael Langer, Stefan Naumann & Swen Loeffler coll. M. Langer/ Nachtfang/ 1642m N26°08'512" E098°34'582" " (ZFMK), 1 ♂ "Myanmar (Burma) Provinz Kachin State ca 20 km N von Panwar 23.V.2006 leg. Michael Langer, Stefan Naumann & Swen Loeffler coll. M. Langer/ Nachtfang/ 2180m N25°43'302" E098°23'353" " (ZFMK).

Redescription.

Body length: 8.1 mm, length of elytra: 4.0 mm, body width: 3.8 mm. Body short-oval, black to dark brown, antenna yellow, dorsal surface except labroclypeus dull or with iridescent or greenish shine, pronotum and elytra glabrous.

Labroclypeus subtrapezoidal, distinctly wider than long, widest at base, lateral margins strongly convex, convergent anteriorly; anterior angles strongly rounded; anterior margin distinctly sinuate medially, margins moderately reflexed; surface with a convex transverse ridge, moderately shiny, coarsely and very densely punctate, with a few erect setae anteriorly; frontoclypeal suture finely incised, evenly curved; smooth area in front of eye convex, 1.5 times as wide as long; ocular canthus short and triangular (1/3 of ocular diameter), densely and finely punctate, with one terminal seta. Frons with fine and sparse punctures, with two long erect setae beside eyes. Eyes small, ratio diameter/ interocular width: 0.51. Antenna with ten antennomeres, club (♂) with four antennomeres and straight, slightly longer than remaining antennomeres combined. Mentum convexly elevated and flattened anteriorly.

Pronotum transverse, widest at base, lateral margins evenly convex and weakly convergent anteriorly; anterior angles distinctly produced and sharp, posterior angles blunt and moderately rounded at tip; anterior margin convex, with a very fine but complete marginal line; surface densely and finely punctate, glabrous, with minute setae in punctures (100 × magnification); lateral border densely setose; hypomeron distinctly carinate basally, not produced ventrally. Scutellum triangular, with fine, dense punctures, glabrous.

Elytra oval, widest in posterior third, striae finely impressed, finely and densely punctate, intervals weakly convex, with dense, fine punctures concentrated along striae, glabrous except a few single, short setae on penultimate lateral interval; epipleural edge robust, ending at convex external apical angle of elytra, epipleura densely setose; apical border with a fine fringe of microtrichomes (visible at 100 × magnification).

Ventral surface dull, finely and densely punctate; metasternum nearly glabrous except a few long robust setae on disc, punctures with minute setae (100 × magnification); metacoxa glabrous, with a few single setae laterally; abdominal sternites finely and densely punctate, with a transverse row of coarse punctures, each bearing a short robust seta, last sternite half as long as penultimate one. Mesosternum between mesocoxae as wide as the mesofemur, with a semi-circular ridge bearing long setae. Ratio of length of metepisternum/ metacoxa: 1/ 1.49. Pygidium dull, strongly convex, finely and densely punctate, without smooth midline, with a few long setae along apical margin.

Legs short; femora moderately shiny, with two longitudinal rows of setae, finely and sparsely punctate, glabrous; metafemur with anterior margin acute, with a continuous, serrated line behind anterior edge, posterior margin smooth ventrally, in apical half only weakly widened, posterior margin smooth dorsally. Metatibia moderately wide and short, widest at middle, ratio of width/ length: 1/ 2.95; dorsal margin sharply carinate, with two groups of spines, basal group shortly behind middle, apical group at 4/5 of metatibial length, in basal half with a serrated line beside dorsal margin ending at basal group of spines, beside it with a few single short setae; lateral face longitudinally convex, finely and densely punctate, smooth along middle; ventral edge finely serrated, with three robust nearly equidistant setae; medial face smooth, apex interiorly near tarsal articulation bluntly truncate and slightly concavely sinuate. Tarsomeres sparsely and finely punctate dorsally, with sparse, short setae ventrally, neither laterally nor dorsally carinate; metatarsomeres with a strongly serrated ridge ventrally, glabrous; first metatarsomere slightly shorter than following two tarsomeres combined and one third of its length longer than dorsal tibial spur. Protibia short, bidentate, distal tooth sharply pointed at apex, external margin bluntly widened at middle; anterior claws symmetrical, basal tooth of inner claw sharply truncate at apex.

Aedeagus: Fig. 4 E–G. Habitus: Fig. 4H.

Variation.

The colour varies from totally black or reddish brown to black with reddish brown elytra. Female: Antennal club also composed of 3 antennomeres, however, the club is slightly shorter than in males, and the first joint of club is slightly shorter.