Phaenochilus albomarginalis Li & Wang

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 : 35

Phaenochilus albomarginalis Li & Wang sp. n. Figs 1 a–k, 2 a–g, 4

Diagnosis.

This new species can be distinguished from Phaenochilus metasternalis by the following combination of characters: lateral margin of elytra yellowish white (Fig. 1 a–b); penis guide nearly symmetrical in ventral view, parameres slightly shorter than penis guide (Fig. 2 b–c). In Phaenochilus metasternalis , lateral margin of elytral yellow or yellowish brown (Fig. 3 a–b); penis guide distinctly asymmetrical in ventral view, slightly shorter than parameres (Fig. 3 g–h).

Description.

TL: 3.67-3.80 mm, TW: 3.60-3.67 mm, TH: 1.87-2.07 mm, TL/TW: 1.02-1.04, PL/PW: 0.66-0.67, EL/EW: 0.96-1.00.

Body roundish, strongly convex (Fig. 1b). Head yellow, sparsely covered with short, greyish pubescence, eyes normally black (Fig. 1c). Pronotum yellow, only anterior angles sparsely covered with short, greyish pubescence. Scutellum and elytra yellow, lateral margin of elytra yellowish white, obvious boundary between two colors (Fig. 1a). Underside entirely yellow, except apex of mandible black with short, greyish pubescence.

Head relatively small, 0.44 times pronotal width, punctures on frons large, 3.0-4.0 diameters apart, surface polished between punctures; eyes subtriangular, densely faceted, widest interocular distance 0.42 times head width (Fig. 1c). 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 (Fig. 1e). Outer margin of mandible slightly curved (Fig. 1f). Terminal maxillary palpomere slender and elongate, approximately three times as long as basal width, with sides nearly parallel (Fig. 1g). Terminal labial palpomere slender and acuminate, rounded at apex (Fig. 1h). Pronotum 0.53 times elytral width, pronotal punctures fine but larger than those on head, 1.5-2.5 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. 1d). Abdominal postcoxal lines incomplete, 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 distinctly emarginate medially (Fig. 2a).

Male genitalia: penis slender and long, penis capsule with short outer arm and long inner arm, apex of penis with small protuberance and membranous appendage (Fig. 2 d–e). Tegmen stout, penis guide gradually broadened to basal 2/5, subparallel to apical 1/5 thereafter, then gradually converging apically to blunt tip in ventral view; only one lateral margin slightly emarginate at basal 3/5 (Fig. 2c). Parameres slightly shorter than penis guide with dense, long setae at inner sides and apices with group of long setae in lateral view (Fig. 2b).

Female genitalia: coxites elongate, triangular (Fig. 2f). Spermatheca oblong-oval, stout, appendage of cornu well-developed (Fig. 2g).

Types.

Holotype, male, CHINA: Yunnan Prov: Tongbiguan, Husa, No. SCAU (E) 15235, [24°37.03'N; 97°39.05'E], ca. 1410m, 23.ix.2006, Wang XM leg. Paratypes. 1 male and 4 females with same data as holotype; 1 male, Yunnan Prov: Nanjingli, Ruili, [24°02.54'N; 97°52.10'E], ca. 811m, 25.ix.2006, Wang XM leg.

Distribution.

China (Yunnan) (Fig. 4).

Etymology.

The species name is derived from Latin and refers to the yellowish white lateral margin of elytra.