Polypedilum (Uresipedilum) bullum sp. n.

(Fig. 3)

Type material: Holotype male (BDN No. 13415): CHINA: Sichuan Province, Xiangcheng County, Shuoqu River, 12, 2700m, 12. VI. 1996, X. Wang.

Etymology: From Latin bulla, knob, refers to a prominent knob at the base of the superior volsella, which is unusual in the subgenus.

Diagnostic characters: Differs from the other species of the subgenus in having a prominent inner process basally on the superior volsella, wing with weak markings, and inferior volsella apically divided into two lobes.

Male imago (n = 1)

Total length 4.00 mm. Wing length 2.65 mm. Total length/ wing length1.51. Wing length /length of profemur 2.58.

Coloration. Head brown. Thorax brown with darker vittae and postnotum. Abdomen and legs brown. Wings brown with weak marking.

Head. AR 1.24. Ultimate flagellomere 662 m long. Temporal setae 12; including 3 inner verticals; 5 outer verticals and 4 postorbitals. Clypeus with 15 setae. Tentorium 159 m long, 47 m wide. Stipes 169 m long. Palpomere lengths (in m): 44, 47, 177, 172, 292.

Wing (Fig. 3A). VR 1.10. Brachiolum with 1 seta, R with 22; R 1 with 14; R 4+5 with 27. R 2+3 near to R 1. Squama with 15 setae. Wing with weak markings.

Thorax. Dorsocentrals 22; acrostichals 15, biserial; prealars 5. Scutellum with 22 setae.

Legs. Terminal scale (Fig. 3B) of front tibia pointed, 52 m long including 16 m long apical spine; spur on median tibiae 42 µm long including 29 m long comb, un­spurred comb 23 m long, spur on posterior tibia 47 m long including 31 m long comb, unspurred comb 23 m long. Width at apex of front tibia 56 m, of middle tibia 60 m, of hind tibia 65 m. Lengths (in m) and proportions of legs (Table 3):

Hypopygium (Figs. 3C–E). Anal tergite bands fused basal to median anal tergite setae. Anal tergite with 10 median setae, laterosternite with 3 setae. Anal point 94 m long, slender and parallel­sided for entire length, ventrally bent at apex. Phallapodeme 117 m long; transverse sternapodeme 70 m long. Gonocoxite 198 m long. Superior volsella 52 m long, base not produced caudally with microtrichiae and 12 long apical setae, a prominent process bearing 12 inner setae basely present in the inner margin of the base; apicomedial projection slender and rounded at apex. Inferior volsella 143 m long; apically divided into 2 lobes, with 12 oral setae and long apical seta respectively. Gonostylus 140 m long, outer margin convex widest in the middle. HR 1.41. HV 2.85.

Distribution: The species was collected by light trap near a river in the Sichuan Province in the Oriental Region.

Remarks: In the examined specimen, the prominent inner process of one superior volsella bears one seta, while the other has two setae; the base of one of the superior volsellae one apical seta, the other two apical setae. In the subgenus, only one species, P. (U.) simantokeleum Sasa has a superior volsella with an inner basal process, but that species is distinctly differing from the new species in several other features.