Scaptodrosophila angustifolia sp. nov.

(Figs 2A–C, 6)

Diagnosis. This species resembles S. coracina (Kikkawa & Peng, 1938) in body colour patterns and with hypandrial hairs, but can be distinguished from it by cercal ventral lobe with large, stout spines on caudoventral margins (Fig. 6A, B); pregonite narrow (Fig. 6C, D). It is closest to S. ventriobscurata in light of genetic divergence calculated with DNA barcodes (p -distance = 0.074; Table 2).

Description. Head (Fig. 2A): Eyes red to brownish red. Ocellar triangle dark brown to black. Frons yellowish brown to dark brown. Anterior reclinate orbital setae usually outside and close to proclinate orbital setae; posterior reclinate orbital seta larger than others. Pedicel and first flagellomere brown to dark brown. Facial carina brown to dark brown, 2/3 as long as face. Face brown to dark brown. Clypeus mostly brown to dark brown. Palpus yellowish brown to brown. Vibrissa prominent; subvibrissal setae small. Gena and postgena narrow.

Thorax (Fig. 2B, C): Mesonotum brown to black brown. Acrostichal setulae in ca. eight regular rows. Pleura dark brown. Three proepisternal setae and some small ones. Katepisternum medially with three large setae and some small ones. Scutellum black brown. Wing hyaline and infuscate. Legs yellowish brown to brown.

Abdomen (Fig. 2B, C): Tergites I to V brown with black caudal bands, tergite I interrupted medially.

Male terminalia (Fig. 6A–D): Epandrium with ca. 6 epandrial bristles near posterior and ventral margins per side. Surstylus with 12 peg-like surstylar teeth and ca. 5 setae on caudal margins (Fig. 6A, B). Hypandrium with a pair of paramedian hypandrial bristle and hypandrial hairs on caudal margins. Postgonite weak. Phallus lacking pubescence (Fig. 6C, D).

Female terminalia (Fig. 6E): Oviscapt slender, slightly curved, gradually expanded to the apex, with a membranous curvilinear process subapically. Oviscapt narrow with 11 peg-like ovisensilla per side on ventral margins. Ovisensilla gradually thicker and thicker to the apex.

Measurements. BL = 2.67 mm in holotype (mm in 1♀ paratypes: 3.07), ThL = 1.00 mm (1.27), WL = 2.27 mm (2.93), WW = 1.00 mm (1.30), arb = 4/2 (4/2), avd = 1.00 (0.88), adf = 2.50 (1.60), flw = 1.50 (1.60), FW/HW = 0.24 (0.24), ch/o = 0.11 (0.11), prorb = 0.67 (0.92), rcorb = 0.58 (0.67), vb = 0.50 (0.50), dcl = 0.53 (0.60), presctl = 0.33 (0.60), sctl = 1.14 (0.91), sterno = 0.85 (0.83), orbito = 0.83 (0.83), dcp = 0.64 (0.50), sctlp = 1.17 (1.13), C = 1.36 (1.58), 4c = 1.75 (1.48), 4v = 2.31 (2.38), 5x = 2.80 (1.89), ac = 3.11 (2.58), M = 0.88 (0.81), C3F = 0.67 (0.60).

Materials examined. Holotype ♂ (SCAU, No. 125162), CHINA: Dupangling, Daoxian, Hunan, 25°48'N, 111°35'E, alt. 477m, 29.viii.2020, HE Peng . Paratype: CHINA: 1♀ (SCAU, No. 125168), same data as holotype .

Distribution. China (Hunan).

Etymology. A combination of the Latin words: “ angustus ” and “ folium ” meaning narrow leaf, referring to the pregonite.