Trioserica maculipennis ( Miyake & Yamaya, 2001 )

Ahrens, Dirk, Liu, Wangang, Fabrizi, Silvia & Bai, Ming, 2021, Taxonomic review on the Trioserica Moser, 1922 species of China (Coleoptera Scarabaeidae: Melolonthinae: Sericini), Zootaxa 4999 (4), pp. 343-355 : 344-345

Trioserica maculipennis ( Miyake & Yamaya, 2001)

Figure 1A–D

Sinoserica maculipennis Miyake & Yamaya, 2001: 40 .

Trioserica maculipennis: Ahrens 2007: 7 .

Type material examined. Holotype, ♂: “ China, Yunnan Baoshan C. 2100 m alt. 10.VII.1998 A. Gorodinski / Holo- type: Sinoserica maculipennis , sp.n. Y. Miyake, 1994” ( NMMJ).

Additional material examined. 1 ♂ “ Mt. Heishan, Longxin, Longling , Yunnan, 23–25.XII.2008, leg. Xu Jis- han, Zou Zhenhua” ( HBUM) , 1 ♂ “ Mt. Gaoligongshan, Tengchong , Yunnan, 9.VIII.2005, 2150m, leg. Mao Be- nyong” ( HBUM) , 1 ♂ “ Yunnan, Lincang, Mt. Wulaoshan , 2010-VII-31, N: 23.90648, E: 100.15944, 1807m. / LW-1304” ( ZFMK) , 1 ♂ “ Yunnan, Lincang, Mt. Wulaoshan , 2010-VII-31, N: 23.90648, E: 100.15944, 1807m.” ( ZFMK) .

Redescription. Length: 8.5 mm, length of elytra: 6.0 mm, width: 4.6 mm. Body oblong, yellowish brown with small dark spots, antenna yellow, dorsal surface moderately dull and almost glabrous.

Labroclypeus subtrapezoidal and wide, widest at base, lateral margins convex and convergent to strongly rounded anterior angles, lateral margin and ocular canthus producing a blunt angle, margins weakly reflexed, anterior margin narrowly emarginate medially; surface distinctly convex medially and shiny, finely and densely punctate, distance between punctures less than their diameter, anteriorly with transversal row of a few long, erect setae. Frontoclypeal suture very feebly incised and medially weakly angled; smooth area in front of eye very short and approximately 1.5 times as wide as long. Ocular canthus short and triangular, laterally sparsely punctate, with a moderately long, single terminal seta. Frons dull, with fine and regularly scattered dense punctures, with a few short setae beside eyes and laterally behind frontoclypeal suture. Eyes small, ratio of diameter/ interocular width: 0.57. Postocular furrow lacking laterally and ventrally. Antenna yellow, composed of 10 antennomeres; club with four lamellae, a little longer than the remaining antennomeres combined. Mentum convexly elevated anteriorly.

Pronotum moderately wide, widest at base, lateral margins weakly but evenly convex and weakly narrowed anteriorly; anterior angles distinctly produced and sharp; posterior angles blunt and distinctly rounded in the tip; anterior margin strongly and convexly produced medially, with a distinct and broad marginal line; basal margin without marginal line; surface with irregularly dense and fine punctures, posterior midline broadly smooth, punctures with microscopic setae; anterior and lateral margins sparsely setose. Hypomeron distinctly carinate at base. Scutellum narrow and short, sharp at apex, with fine and dense punctures, medially not smooth, microscopic setae present in punctures.

Elytra oblong, widest behind middle; striae distinctly impressed and finely and densely punctate; intervals densely finely punctate, even ones almost flat, odd ones very weakly convex; epipleural margin robust, ending at strongly curved external apical angle of elytra; epipleura sparsely setose; apical border membraneous, with a rim of short microtrichomes.

Ventral surface dull, with large and dense punctures, sparsely and shortly setose, setae partly adpressed. Mesosternum between mesocoxae as wide as mesofemur, with irregularly scattered robust and long setae. Ratio of length of metepisternum/ metacoxa: 1/ 1.48. Metacoxa glabrous, laterally with fine setae. Each abdominal sternite with indistinct transversal row of coarse punctures bearing each a robust seta between fine and dense punctation. Pygidium evenly convex, finely and densely punctate, without smooth midline, glabrous, with a few longer setae beside apical margin.

Legs narrow and moderately long, with shiny surface; femur with two longitudinal rows of setae, finely and moderately densely punctate. Metafemur ventrally dull, sharply carinate anteriorly, without a submarginal serrated line; posterior margin straight, ventral posterior margin in distal half only weakly widened and smooth; dorsal margin smooth, with short setae. Metatibia moderately narrow and moderately long, widest at middle; ratio width/ length: 1/ 3.5; dorsal margin completely sharply carinate, with two groups of spines; basal group of spines at one third of metatibial length, apical one at three quarters of metatibial length; lateral face longitudinally convex, with a fine and very sparse punctures; ventral margin finely serrated, with four robust, equidistant spines; medial face impunctate, apex interiorly near tarsal articulation sharply truncate. Tarsomeres dorsally glabrous and finely punctate; pro- and mesotarsomeres ventrally with dense and short setae. Metatarsomeres ventrally glabrous, with a strongly serrated, longitudinal carina immediately beside it weak; metatarsomere 1 distinctly longer than following tarsomere and one third of its length longer than dorsal tibial spur. Protibia moderately long, tridentate, protarsal claws lacking in holotype.

Aedeagus: Figs 1A–C . Habitus: Fig. 1D .

Figures

FIGURE 1. A–D: Trioserica maculipennis (Miyake & Yamaya, 2001) (holotype); E–H: T. dinghushanica Ahrens, Liu & Fabrizi, new species (holotype); I–L: T. lilongensis Ahrens, Liu & Fabrizi, new species (holotype). A, E, J: aedeagus, left side lateral view; C, H, L: aedeagus, right side lateral view; B, F, G, K: parameres, dorsal view; D, I, M: habitus. Scale: 0.5 mm. Habitus not to scale.