Stegana (Steganina) sciophila Li & Chen, sp. nov.

(Figs. 13C, 13D, 59)

Diagnosis. This species is similar to S. (S.) hirticeps Wang, Gao, & Chen, 2013 in the shape of male terminalia (as fig. 5 in Wang et al. 2013, Fig. 59), but can be distinguished from the latter by having the surstylus with 1 peg-like tooth near distal margin (Fig. 59A, B); the subepandrial sclerite vaulted, bifurcated basally per side, roundly expanded distally (Fig. 59G).

Description. Male and female: First flagellomere brown. Clypeus yellow. Mesonotum dark brown medially, brownish laterally (Fig. 13C). Katepisternum yellowish (Fig. 13D). Scutellum mostly yellow, brown anteromedially (Fig. 13C). Halter mostly brownish (Fig. 13D). Fore femur with a row of 4 long setae on distal part of posteroventral surface. Abdominal tergites dark brown to black (Fig. 13C, D); sternites brown in male, yellow in female, about 2.2 times as wide as long. Male terminalia (Fig. 59): Epandrium with ca. 8 setae on dorsal to posterior portions per side (Fig. 59A). Surstylus with some minute, serrated processes on outer surface and setulae near distal margin, lacking pubescence (Fig. 59A). Cercus lacking pubescence (Fig. 59A). Hypandrium roundly expanded anteromedially (Fig. 59C, D). Pregonite small, with 2 sensilla (Fig. 59C, D). Aedeagus with much pubescence distomedially (Fig. 59C, D). Aedeagal sheath distally dorsad curved and with several minute, serrated processes (Fig. 59E, F).

Measurements and indices. BL = 3.07 mm in holotype (2.54–2.88 in 4♂, 3.13–3.21 in 3♀ paratypes), ThL = 1.48 mm (1.21–1.36 in ♂, 1.36–1.49 in ♀), WL = 2.97 mm (2.33–2.78 in ♂, 2.64–2.91 in ♀), WW = 1.23 mm (0.92–1.04 in ♂, 1.01–1.31 in ♀), arb = 7/5 (5–7/4–5), avd = 0.76 (0.73–0.91), adf = 1.44 (0.96–1.30), flw = 2.05 (1.53–2.21), FW/HW = 0.34 (0.33–0.39), ch/o = 0.19 (0.26–0.34), prorb = 1.09 (1.07–1.46), rcorb = 0.78 (0.69– 1.04), vb = 0.87 (0.60–0.82), dcl = 0.43 (0.49–0.82), presctl = 0.49 (0.55–0.83), sctl = 2.33 (1.66–3.04), sterno = 0.81 (0.69–1.45), orbito = 1.43 (1.56–2.00), dcp = 0.31 (0.31–0.37), sctlp = 1.73 (1.14–1.92), C = 1.82 (1.60–1.95), 4c = 1.19 (1.02–1.22), 4v = 1.84 (1.51–1.69), 5x = 1.94 (1.33–1.69), ac = 9.33 (9.91–14.00), M = 0.66 (0.51–0.60), C3F = 0.62 (0.55–0.64).

Type materials. Holotype ♂ (SCAU, No. 125717, DNA #2667), CHINA: Jinshan, Menglian, Yunnan, 22°19'29''N, 99°35'00''E, alt. 940m, 25.x.2017, ex tree trunk, H.W. Chen . Paratypes: 3♂, 1♀ (SCAU, Nos. 125718– 21), L. Gong, B.X. Li, other data same as holotype; 1♂, 2♀ (SCAU, Nos. 125722–24, DNA #2668), Muyiji Park, Ximeng, Yunnan, 22°37'23''N, 99°36'11''E, alt. 1100m, 16.iv.2018, ex tree trunks, H.W. Chen, L. Gong.

Distribution. China (Yunnan).

Etymology. From the Greek word " sciophilous " (= sciophilous), referring to the sciophilous Steganina flies.