Phaenochilus metasternalis Miyatake, 1970

Li, Wenjing, Huo, Lizhi, Chen, Xiaosheng, Ren, Shunxiang & Wang, Xingmin, 2017, A new species of the genus Phaenochilus Weise from China (Coleoptera, Coccinellidae, Chilocorini), ZooKeys 644, pp. 33-41 : 36-37

Phaenochilus metasternalis Miyatake, 1970 Figs 3 a–j, 4

Phaenochilus metasternalis Miyatake, 1970: 334; Pang and Mao 1979: 78; Cao 1992: 152; Ren et al. 2009: 138.

Diagnosis.

This species can be distinguished from the other species of Phaenochilus by the following combination of characters: the elytral bead yellow or yellowish brown (Fig. 3 a–b); male abdomen ventrite 6 weakly emarginate at middle (Fig. 3d); penis guide distinctly asymmetrical in ventral view and coxites elongate, triangular (Fig. 3 h–i).

Description.

TL: 3.33-3.67 mm, TW: 3.13-3.47 mm, TH: 1.67-2.00 mm, TL/TW: 1.04-1.06, PL/PW: 0.72-0.74, EL/EW: 1.00-1.02.

Body roundish, strongly convex (Fig. 3b). Head yellow, sparsely covered with short, greyish pubescence, eyes normally black (Fig. 3c). Pronotum yellowish brown, only anterior angles sparsely covered with short, greyish pubescence. Scutellum, elytra, and elytral bead yellowish brown (Fig. 3a). Underside entirely yellowish brown or brown, except apex of mandible black with short, greyish pubescence.

Head relatively small, 0.56 times pronotal width, punctures on frons large, 2.5-4.0 diameters apart, surface polished between punctures; eyes subtriangular, densely faceted, widest interocular distance 0.40 times head width (Fig. 3c). Antennae composed of eight antennomeres, scape and pedicel slightly elongate, scape and pedicel of similar length and width, antennomeres 3-5 equal in length, antennomeres 6-8 gradually longer. Outer margin of mandible slightly curved. Terminal maxillary palpomere slender and elongate, approximately three times as long as basal width, with sides nearly parallel. Terminal labial palpomere slender and acuminate, rounded at apex. Pronotum 0.52 times elytral width, pronotal punctures fine but larger than those on head, 2.0-3.0 diameters apart, surface polished between punctures. Punctures on elytra fine, similar to those on pronotum, 2.0-4.0 diameters apart. Epipleuron without fovea to reccept mid and hind legs. Prosternal process short, narrow at base, gradually broadened to apex (Fig. 3d). Abdominal postcoxal lines ncomplete, reaching posterior margin of abdominal ventrite 1 and running along posterior margin, almost reaching lateral margin. Posterior margin of male abdominal ventrite 5 truncate and ventrite 6 slightly emarginte medially (Fig. 3d).

Male genitalia: penis slender and long, outer arm of penis capsule slightly longer than inner arm, apex of penis with a small protuberances and membranous appendage inside (Fig. 3 e–f). Tegmen stout, penis guide knife-like in ventral view (Fig. 3h). Parameres as long as penis guide with dense short setae at inner sides and apices with patches of short setae visible in lateral view (Fig. 3g).

Female genitalia: coxites elongate, triangular (Fig. 3i). Spermatheca oblong-oval, stout, appendage of cornu well-developed (Fig. 3j).

Material examined.

Yunnan: 2 males, Ruili, [24°01.03'N; 97°46.23'E], ca. 1159m, 27.vii.2005, Wang XM leg; 1 male, Maku, Dulongjiang, [27°40.57'N; 98°18.19'E], ca. 1600m, 1.viii.2010, Wang XM leg; 2 females, Galaxi, Lianhuatan, Hekou, [22°57.03'N; 103°28.54'E], ca. 800m, 21.V.2009, Ren SX leg. Guangdong Prov: 3 males, Huangdong, Shimentai, [24°25.30'N; 113°18.28'E], ca. 480m, 31.x.2004, Wang XM leg;1 male, Nankunshan, Huizhou, [23°38.08'N; 113°53.34'E], ca. 491m, x.2004, Wang XM leg. Guangxi Prov: 1 male, Daxiagu, Maoershan, [25°50.46'N; 110°29.14'E], ca. 406m, 19.x.2004, Wang XM leg; 1 male, Hongqilinchang, Shiwandashan, [21°54.07'N; 107°54.26'E], ca. 438m, 11.xi.2004, Wang XM leg. Anhui Prov: 2 males, Huangshan, [38°08.52'N; 118°07.58'E], ca. 1250m, 30.vii.2005, Qin ZQ leg; 2 males, Huangshan, [38°08.39'N; 118°08.45'E], ca. 1367m, 14-15.ix.2010, Wang XM leg. Hainan Prov: 1 female, Yinggeling, [19°10.26'N; 109°41.08'E], ca. 850m, 23.xi.1997, Peng ZQ leg; 1 male, Bawangling, [19°03.51'N; 109°11.47'E], ca. 738m, 5.v.2005, Peng ZQ leg. Hunan Prov: 2 males, Shennonggu, Yanling, [26°30.01'N; 114°00.27'E], ca. 1100m, 7.x.2010, Wang XM leg. Guizhou Prov: 1 male, Datangwan, Leigongshan, [26°21.28'N; 108°10.01'E], ca. 1100m, 5.x.2008, Wang XM leg.

Distribution.

China (Anhui, Hunan, Guangdong, Guangxi, Hainan, Guizhou, Yunnan) (Fig. 4); Laos; Vietnam; Singapore; Indonesia.