Autoserica straminea Moser, 1915c: 156

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 : 139-141

Autoserica straminea Moser, 1915c: 156 .

Maladera straminea: Ahrens 2006b: 238, 2007b: 24 .

Type material examined. Syntype: 1 ♂ “ Kiukiang China / Autoserica straminea Type Mos./ straminea ” ( ZMHB) (head and prothorax missing in only available syntype) .

Additional material examined. China. 4 ex. “ Yunnan 1800-2500 m 25.10N 100.21E Weishan mts. 22.-25.6.92 David Kral lgt.” ( CK), 2 ex. “China: Yunnan; 1800-2500 m, 25.10N 100.21E Weishan Mt. D. Král lgt.” ( ZFMK), 1 ex. “ Yunnan 2000-2800 m 25.11N 100.24E Weibaoshan mts. W slope 25-28/6.92 Vit Kuban leg.” ( CN), 3 ex. (♀) “ Yunnan 2000-2500 m 25.42N 100.08E Cangshan mts. E slope 21/6.92 Vit Kuban leg.” ( CN, CA), 1 ♂ “Luoxiang, Jinxiu, Guangxi, 23.V. 1999, 200m, leg. Zhang Xuezhong“ ( IZAS), 1 ♂ “China, SE—Yunnan 1300-1600m, Maguan Wenshan karst region 23°11-15‘/ 104°18-25‘/ 18.-19.5.95 L.+R. Businsky lgt.“ ( CP). Vietnam. 1 ♂ “Vietnam N (Sa Pa) Lao Cai Prov., 250 km from Hanoi bearing 31° Sa Pa vill. env. Hoang Lien Son Nat. Res., 9.- 15.6.1998 1250 m leg. A. Napolov“ ( CNA), 1 ♂ “Vietnam N 1990 Sa-Pa 11-19.VI. 2500 m Hoang Lien Son prov. Strnad Jan lgt.” ( CP), 1 ex. “Vietnam-N (Ben En) 180 km SSW Hanoi, 40 km SW Than Hoa, Ben En Nat. Park 23.7.- 20.8.1997 50 m lg. A. Napolov“ ( ZFMK), 1 ex. “Vietnam N (Sa Pa) Lao Cai Prov., 250 km from Hanoi bearing 31° Sa Pa vill. env. Hoang Lien Son Nat. Res., 21.- 23.6.1998 1250 m leg. A. Napolov“ ( CNA), 3 ex. “Vietnam N (Sa Pa) Lao Cai Prov., 250 km from Hanoi bearing 31° Sa Pa vill. env. Hoang Lien Son Nat. Res., 16.- 20.6.1998 1250 m leg. A. Napolov“ ( CNA), 1 ex. “Vietnam N (Sa Pa) Lao Cai Prov., 250 km from Hanoi bearing 31° Sa Pa vill. env. Hoang Lien Son Nat. Res., 27.V.-15.VI.1995 1250 m leg. A. Napolov“ ( CNA), 2 ex. “Vietnam-N (Na Hang) 160 km NW Ha Noi, NE env. of Na Hang 3.6.- 14.6.1996 150-200 m lg. A. Napolov & I. Roma“ ( CNA), 6 ex. “N-Vietnam, Bac Giang Prov., Tay Yen Tu Nat. Res., Thanh So‘n, N 21° 12.812‘ E 106° 45.846‘, 86m 18.5.-21.5.5.2015, leg. A. Skale“ ( CASH), 2 ex. “N. Vietnam Bac Kan Prov., Ba Bè NP (entry), 16.-20.V.2014, 22°25‘07‘‘N, 105°38‘09‘‘E, 180-200m, leg. A. Skale “ ( CASH), 2 ex. “N-Vietnam Cao Bang Prov., vic. Vin Den, Nui Pia Oac Nat. Res. 06.-10.V.2013, 22°33‘53‘‘N, 105°52‘53‘‘E 900-1300m A. Skale“ ( CASH), 1 ex. (♀) “N-Vietnam Cao Bang Prov., vic Tinh Tuc, Son Dong, Nui Pia Oac Nature Reserve, 9.-15.V.2014 22°37‘55‘‘N, 105°52‘98‘‘E 850-1300m leg. A. Skale“ ( CASH), 1 ex. “N-Vietnam, P: Thai Nguyen, vic. Ngoc Than, Me Linh (IEBR station), 13.V.2017, 21°23‘3‘‘N, 105°42‘44‘‘E, 65m NN, leg. A. Weigel, LFF“ ( NME).

Redescription. Length: 8.1 mm, length of elytra: 6.4 mm, width: 5.0 mm. Body oblong-oval, dark yellowish brown, dull, labroclypeus shiny, dorsal face nearly glabrous, only with a few erect long setae on pronotum, head and elytra.

Labroclypeus wide and subtrapezoidal, widest at base, lateral margins weakly convex and convergent anteriorly, anterior angles moderately rounded, anterior margin shallowly emarginate and distinctly reflexed medially, margins moderately reflexed; lateral margin and ocular canthus produce an indistinct angle; surface convexly elevated along middle, finely, densely punctate, with a few erect, long setae; frontoclypeal suture distinctly incised, bluntly angled medially; smooth area anterior to eye very small and flat, 3 times as wide as long; ocular canthus short and wide (1/3 of ocular diameter), finely densely punctate, with a terminal seta. Frons dull, with very sparse and superficial punctures, with a few single setae beside eyes and behind frontoclypeal suture. Eyes moderately large, ratio diameter/ interocular width: 0.58. Antenna with ten antennomeres; club with three antennomeres and straight, as long as remaining antennomeres combined. Mentum elevated and slightly flattened anteriorly.

Pronotum moderately transverse, widest at middle, lateral margins evenly convex and convergent towards angles, anterior angles moderately produced and blunt, posterior angles blunt, rounded at tip; anterior margin straight, with fine marginal line, base without marginal line; surface moderately finely and densely punctate, with minute setae in punctures and a very few long setae on lateral disc; anterior and lateral margin finely setose; hypomeron carinate, not produced ventrally. Scutellum wide, triangular, with fine, sparse punctures.

Elytra widest in posterior third, striae finely impressed, finely and densely punctate, intervals flat, with fine, sparse punctures and with minute setae in punctures, odd intervals with a very few long single setae (often abraded); epipleural margin fine, ending behind middle of elytra, epipleura sparsely setose; apical border of elytra membraneous, with a very fine rim of microtrichomes (visible at ca 100x magnification).

Ventral surface dull, finely and densely punctate, nearly glabrous, metasternal disc sparsely covered with fine, short setae; metacoxa with a few longer setae laterally. Abdominal sternites finely and densely punctate, punctures with minute setae, each sternite with a transverse row of punctures each bearing a fine seta. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/2.0. Pygidium moderately convex, dull, coarsely and moderately densely punctate, without smooth midline, with a few long setae beside apical margin.

Legs short and wide, dull; femora with two longitudinal rows of setae, finely and sparsely punctate. Anterior margin of metafemur acute, without adjacent serrated line, anterior row of setae completely reduced; posterior ventral margin smooth, moderately widened at ventral apex, dorsal posterior margin smooth, neither serrate, glabrous. Metatibia short and wide, widest at middle, ratio of width/length: 1/2.3, sharply carinate dorsally, with two groups of spines, basal group at middle, apical group at three quarters of metatibial length, in basal half with a few short and robust single setae; lateral face longitudinally convex, superficially and sparsely punctate, along midline widely smooth, glabrous; ventral margin finely serrate, with four equidistant robust setae; medial face smooth and glabrous; apex finely serrate, shallowly emarginate interiorly near tarsal articulation. Tarsomeres dorsally impunctate, glabrous, neither laterally nor dorsally carinate, moderately setose ventrally; metatarsomeres with a strongly serrated ridge ventrally and a smooth subventral longitudinal carina, glabrous; first metatarsomere distinctly shorter than following two tarsomeres combined and slightly longer than dorsal tibial spur. Protibia moderately long, bidentate; anterior claws symmetrical, basal tooth of both claws bluntly truncate at apex.

Aedeagus: Fig. 30 A–C. Habitus: Fig. 30D .

Distribution. See map ( Fig. 103 ) and Table 1.

Figures

FIGURE 30. A–D: Maladera straminea (Moser, 1915) (China: Guangxi: Luoxiang); E–H: M. botrytibia Nomura, 1974 (Thailand: Mae Hong Son); I–L: M. subtruncata (Fairmaire, 1887) (China: Yunnan: Nabanhe). A, E, I: aedeagus, left side lateral view; C, G, K: aedeagus, right side lateral view; B, F, J: parameres, dorsal view; D, H, L: habitus. Scale: 0.5 mm. Habitus not to scale.

FIGURE 103. Distribution of the Maladera thomsoni group: Maladera jaintiaensis Ahrens & Fabrizi 2016, M. juxianensis sp. n., M. kubeceki sp. n., M. pseudosenta sp. n., M. senta (Brenske, 1897), M. straminea (Moser, 1915), M. subtruncata (Fairmaire, 1887).