(Figs. 1 – 7)

Diagnosis. – Ocellar setae absent; third tergite without dark brown patches; surstylus with ca. 27 strong setae on inner surface (Figs. 4, 5); cercus nearly triangular (Fig. 4); aedeagus (basiphallus) expanded and extroverted in ventral view (Fig. 6), triangular basally in lateral view (Fig. 7).

Material examined. – Holotype: male, CHINA: Jianfengling (18°41'N 108°52'E, alt. 900 m), Hainan, ex. fallen logs, coll. Hongwei Chen, 19 May 2004.

Description. – Head (Fig. 4): Eye red. Postvertical setae long, ca. 0.4 times as long as inner vertical setae, inserted at vertical ridge. Frons narrow, black, with dense grey pollinosity. Ocellar triangle black. Pedicel and first flagellomere brown; arista short plumose with pubescence basally. Face, clypeus, postgena and occiput glossy black. Gena glossy black, narrow and linear. Palpus large, black, lobe-like, with a few short setae on lateral margin. Vibrissa prominent; other orals small.

Thorax: Black with dense grey pollinosity. Postpronotal lobe with 1 long and 3 short thick setae. Acrostichal setulae in ca. 8 irregular rows. Anepisternum lacking setulae. Katepisternal setae 2. Scutellar black, yellow on tip; basal setae divergent; apical setae cruciate. Subscutellum swollen in lateral view. Wing (Fig. 1): Hyaline, veins grey yellow. Basal medialcubital crossvein absent. C 1 setae 2, thick. Costal vein with strong setae on ventral surface between R 2+3 and R 4+5. C3F = 0.25. R 2+3 straight. Halters white.

Legs: Yellow except for dark brown third to fifth tarsomeres. Fore femur without long setae on posterior surface; midfemur with a row of strong setae on anterior surface (Fig. 2); apical setae present on fore- and hind tibiae; preapical setae present on mid tibia only. Mid tarsus ventrally with 2 rows of minute cuneiform setulae; hind tarsus lacking minute cuneiform setulae. All first tarsomeres longer than the rest combined.

Abdomen: All tergites yellow; fourth to sixth tergites medially and sublaterally with dark brown patches; six tergite very small, narrowed on lateral margins (Fig. 4). Sternites yellowish except for brown on fifth; sixth sternite (queried) developed (Figs. 6, 7).

Male terminalia: Epandrium not constricted mid-dorsally, with ca. 12 setae and pubescence (Fig. 4). Cercus separated from epandrium, pubescent and setigerous (Fig. 4). Hypandrium anteriorly broadened, with 2–3 pairs of paramedian setae, mid-anteriorly connected with ventral branch of aedeagal apodeme (Figs. 6, 7). Decasternum forming small posteromedian lobe, baso-laterally contiguous to posterior ends of hypandrium and anteroventral corners of epandrium (Figs. 6, 7). Aedeagus sclerotized dorsally, membranous ventrally (Fig. 7). Aedeagal apodeme long, rod-shaped, with a ventral branch submedially (Figs. 6, 7).

Female: Unknown.

Measurements: BL = 3.75 mm; ThL = 2.10 mm; WL = 3.60 mm; WW = 1.55 mm.

Indices: arb = 15/12, avd = 0.80, adf = 0.68, flw = 1.85, FW/HW = 0.31, ch/o = 0.05, prorb =0.41, rcorb = 0.83, vb = 0.44, dcl = 0.41, presctl = 0.57, sctl = 0.82, sterno = 0.76, orbito = 2.14,dcp = 0.27, sctlp = 0.86, C = 5.74, 4c = 0.43, 4v = 1.13, 5x = 0.58, ac = 0.77, M = 0.23, C3F = 0.25.

Etymology. – A combination of the Latin words: flavus + pedes, referring to the yellow legs.

Distribution. – China (Hainan).