Scaptodrosophila polytricapillum sp. nov.

(Figs 4D–F, 11)

Diagnosis. This species resembles S. helvpecta Liu & Chen, 2018 in the pattern on the abdomen tergites and shape of surstylus, but can be distinguished from the latter by surstylus palm shaped in posterior view (Fig. 11A); postgonite large, expanded antrorsely, with pubescence basally (Fig. 11C, D). This species exhibits the closest genetic affinity to S. longiciliata in light of divergence in COI barcodes (Table 2).

Description. Head (Fig. 4D): Frons dark brown. Pedicel brown. First flagellomere grayish. Facial carina hazel, short, 1/3 the length of face.

Thorax (Fig. 4E, F): Mesonotum brown. Scutellum brown. Pleura brown.

Abdomen (Fig. 4E, F): Tergites III to VI brown with dark brown caudal bands.

Male terminalia (Fig. 11A–D): Epandrium with ca. 15 epandrial bristles near posterior and ventral margins per side. Surstylus with 5 peg-like surstylar teeth on caudal margins (Fig. 11A, B). Hypandrium with a pair of paramedian hypandrial bristle. Phallus lacking pubescence (Fig. 11C, D).

Female terminalia (Fig. 11E): Oviscapt narrow with 1 long subapical trichoid ovisensillum, 18 peg-like ovisensilla per side on ventral margins. Ovisensilla dense at both ends, sparse in the middle.

Measurements. BL = 2.40 mm in holotype (mm in 1♂ and 1♀ paratypes: 2.62 in ♂, 2.58 in ♀), ThL = 1.56 mm (1.24 in ♂, 1.20 in ♀), WL = 2.76 mm (2.36 in ♂, 2.49 in ♀), WW = 1.02 mm (0.98 in ♂, 1.07 in ♀), arb = 3/2 (3/2), avd = 0.75 (0.73–0.92), adf = 2.67 (1.96–2.31), flw = 2.67 (2.28–2.29), FW/HW = 0.35 (0.27–0.33), ch/o = 0.14 (0.10–0.11), prorb = 0.54 (0.50–0.56), rcorb = 0.38 (0.38–0.41), vb = 0.61 (0.44–0.57), dcl = 0.48 (0.46–0.50), presctl = 0.66 (0.38–0.56), sctl = 0.71 (0.72–1.37), sterno = 0.92 (0.92–0.96), orbito = 0.39 (0.55–0.60), dcp = 0.28 (0.23–0.30), sctlp = 0.85 (0.86–0.92), C = 4.36 (4.08–4.80), 4c = 0.52 (0.50–0.55), 4v = 1.67 (1.50–1.70), 5x = 0.86 (0.88–1.14), ac = 1.38 (1.33–1.43), M = 0.29 (0.32–0.40), C3F = 0.73 (0.70–0.75).

Materials examined. Holotype ♂ (SCAU, No. 125124), CHINA: Mengdong, Cangyuan, Yunnan, 23°10'N, 99°13'E, alt. 1323m, 6.v.2016, YQ Liu . Paratypes: CHINA: 1♂ (SCAU, No. 125125), Muyiji, Ximeng, Yunnan, 22°37'N, 99°35'E, alt. 1203m, 30.iv.2016, YQ Liu ; 1♀ (SCAU, No. 125123), Botanic Garden, Ruili, Yunnan, 24°01'N, 97°51'E, alt. 1154m, 22.iv.2018, HW Chen .

Distribution. China (Yunnan).

Etymology. A combination of the Latin word “ polytrichus ” + “ capillus ”, referring to the postgonite with pubescence basally.