Maladera hongkongica ( Brenske, 1898 )

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 : 78-79

Maladera hongkongica ( Brenske, 1898)

Figures 15 L–P, 91

Autoserica hongkongica Brenske, 1898: 208 ; Moser 1908: 325.

Maladera hongkongica: Nomura 1974: 112 ; Ahrens 2004a: 275; Ahrens & Fabrizi 2016: 237.

Type material examined. Lectotype (here designated): ♀ “ Hongkong / hongkongica type Brsk./ Coll. Brenske / hongkongica Brsk. ” ( ZMHB) . Paralectotype (here designated): ♀ “ Hongkong / hongkongica type Brsk./ Coll. Brenske/ hongkongica Brsk. ” ( ZMHB) .

Additional material examined. China: 1 ♂ “ Dinghu , Guangdong, 26.IV.1965, leg. Zhang Youwei / LW-785” ( IZAS) , 1 ♂ “ Mengla, Jinping , Yunnan, 17.IV. 1956, 370m, leg. Huang Keren etc.” ( IZAS) , 1 ♂ “ Jingdong, Yunan , 6.V.1956, 1200m, leg. Monschadskij ” ( IZAS) , 1 ♂ “ Hong Kong : Lantau I San Shek Wan; v.1988 / C. O’Connell Coll. Bishop Museum Acc. No. 1988.363” ( BMH) , 1 ♂ “ China, Canton , 29.IV.1911 Mell S.V.” ( ZMHB) , 1 ♂ “China, Wang-lung-kum, Berggebiet d. Lo-fau-zan/ am Ostfluss in Kuangtung 4.-5.12 Mell. S.V.” ( ZMHB) , 1 ♂ “ China, Canton , 8.V.1911 Mell S.V.” ( ZMHB) , 1 ♂ “ China, Guangdong prov. Guangzhou (university campus) 6.v.2011 Jiri Hajek leg.” ( NMPC) . Thailand: 1 ♂ “NW Thailand 30.4.1992 Mae Hong Son 350m S. Bily leg./ 445 Sericini Asia spec.” ( NHMB) . Vietnam: 5 ♂♂, 7 ♀♀ “ Tonkin Montes Mauson April , Mai 2-3000‘ H. Fruhstorfer ” ( ZMHB) .

Redescription. Length: 10.1 mm, length of elytra: 7.4 mm, width: 6.2 mm. Body oblong-oval, dark brown, antenna yellowish, surface dull, labroclypeus shiny, glabrous.

Labroclypeus wide and subtrapezoidal, widest at base, lateral margins straight and convergent anteriorly, anterior angles strongly rounded, anterior margin weakly emarginate medially; margins moderately reflexed; lateral margin and ocular canthus produce an indistinct angle; surface flat, with an indistinct longitudinal elevation behind anterior margin, coarsely, densely punctate, glabrous; frontoclypeal suture distinctly incised, angled medially; smooth area anterior to eye convex, 2.5 times as wide as long; ocular canthus short and narrow (1/3 of ocular diameter), finely densely punctate, with a fine terminal seta. Frons dull, with moderately dense, fine punctures, with a few long setae beside eyes. Eyes moderately large, ratio diameter/ interocular width: 0.6. Antenna with ten antennomeres; club with three antennomeres and straight, 1.1 times as long as remaining antennomeres combined. Mentum elevated and slightly flattened anteriorly.

Pronotum transverse, widest at base, lateral margins moderately evenly convex and convergent anteriorly, anterior angles distinctly produced and sharp, posterior angles moderately rounded; anterior margin weakly convex, with fine complete marginal line, base without marginal line; surface moderately finely and densely punctate, with minute setae in punctures; anterior and lateral margin sparsely finely setose; hypomeron carinate, not produced ventrally. Scutellum wide, triangular, with fine, moderately dense punctures.

Elytra widest at posterior third, striae finely impressed, finely and densely punctate, intervals flat, with fine, moderately dense punctures, with minute setae in punctures, otherwise glabrous, penultimate interval with a few long erect setae; epipleural margin robust, ending at nearly blunt external apical angle of elytra, epipleura sparsely setose; apical border of elytra membraneous, with a fine rim of microtrichomes (visible at ca 100x magnification).

Ventral surface dull, finely and densely punctate, with dense and fine, adpressed setae, metasternal disc sparsely covered with longer setae; metacoxa with a few longer setae laterally. Abdominal sternites finely and densely punctate, glabrous, 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: 1/1.7. Pygidium weakly convex, dull, finely and sparsely punctate, without smooth midline, with a few long setae along apical margin.

Legs short and wide; femora dull, with two longitudinal rows of setae, finely and sparsely punctate. Anterior margin of metafemur acute, without adjacent serrated line, anterior row of setae except two setae at apex of metafemur reduced; posterior ventral margin smooth, strongly widened at 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 single spines close to dorsal margin; lateral face longitudinally convex, nearly entirely impunctate, only a few fine superficial punctures beside dorsal and ventral margin, 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; first metatarsomere little shorter than following two tarsomeres combined and as long as dorsal tibial spur. Protibia moderately long, bidentate; anterior claws symmetrical, basal tooth of both claws bluntly truncate at apex.

Aedeagus: Fig. 15 L–O. Habitus: Fig. 15P .

Remarks. All syntypes were female; thus the species was reinterpretated by fit of external morphology and geographical occurrence (closest to type locality).

Distribution. See map ( Fig. 91 ) and Table 1.

Figures

FIGURE 15. A–F: Maladera formosae (Brenske, 1898) (Taiwan: Amping); G–K: M. ovatula (Fairmaire, 1891) (China: Sichuan: Wolong); L–P: M. hongkongica (Brenske, 1898) (China: Guangdong: Dinghu). A, G, L: aedeagus, left side lateral view; E, J, O: aedeagus, right side lateral view; B, H, M: aedeagus, dorsal view; C, D, I, N: aedeagus, dorsal view; F, K, P: habitus. Scale: 0.5 mm. Habitus not to scale.

FIGURE 91. Distribution of the subgenus Omaladera: Maladera enigma sp. n., M. formosae (Brenske, 1898), M fusca (Frey, 1972), M. guangdongana sp. n., M. hongkongica (Brenske, 1898).