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

(Figs. 12E, 12F, 55)

Diagnosis. This species is similar to S. (S.) menghai sp. nov. in the shape of male terminalia (Figs. 50, 55), but can be distinguished from the latter by having the pregonite blurry or absent (Fig. 50B, C); the aedeagus laterally deeply dehiscent and with 4 small black teeth per side, distally lacking serrated process (Fig. 55B, C).

Description. Male and female: First flagellomere dark brown. Clypeus dark brown medially, yellow laterally. Mesonotum brown to black medially, brownish yellow to brown laterally (Fig. 12E). Katepisternum yellow above, brownish below (Fig. 12F). Scutellum dark brown to black (Fig. 12E). Halter mostly grey (Fig. 12F). Fore femur with a row of 3 or 4 long setae on distal part of posteroventral surface. Abdominal tergites mostly black (Fig. 12E, margin, lacking pubescence (Fig. 55A). Cercus with much pubescence (Fig. 55A). Hypandrium expanded anteromedially (Fig. 55B, C). Aedeagal sheath distally dorsad curved and with numerous minute, serrated processes (Fig. 55D, E). Subepandrial sclerite vaulted (Fig. 55F).

Measurements and indices. BL = 3.28 mm in holotype (2.88–3.52 in 5♂, 3.24–4.20 in 5♀ paratypes), ThL = 1.44 mm (1.43–1.80 in ♂, 1.76–2.05 in ♀), WL = 2.44 mm (2.36–3.00 in ♂, 2.72–3.24 in ♀), WW = 1.20 mm (1.10–1.40 in ♂, 1.208–1.60 in ♀), arb = 14/5 (8–14/4–6), avd = 0.60 (0.44–0.91), adf = 1.43 (1.57–2.25), flw = 1.57 (1.50–2.60), FW/HW = 0.38 (0.27–0.38), ch/o = 0.22 (0.13–0.27), prorb = 1.25 (0.75–1.14), rcorb = 0.92 (0.58–1.17), vb = 0.75 (0.29–0.67), dcl = 0.75 (0.27–0.75), presctl = 0.63 (0.50–0.93), sctl = 1.50 (1.24–1.93), sterno = 0.92 (0.59–0.82), orbito = 2.60 (1.67–2.50), dcp = 0.21 (0.18–0.26), sctlp = 1.73 (1.50–2.27), C = 2.62 (1.73–2.25), 4c = 0.81 (1.09–1.26), 4v = 1.63 (1.63–2.19), 5x = 1.60 (1.36–2.00), ac = 13.00 (10.00–21.25), M = 0.50 (0.50–0.81), C3F = 0.57 (0.69–0.82).

Type materials. Holotype ♂ (SCAU, No. 121132), CHINA: Maoershan, Xing'an, Guangxi, 25°51'28''N, 110°25'01''E, alt. 700m, 23.x.2004, ex tree trunk, H.W. Chen . Paratypes: 6♂, 18♀ (SCAU, Nos. 121133–56, DNA #1461, 1462), 19.x.2006, other data same as holotype; 2♀ (SCAU, Nos. 125606, 07, DNA #2190), Yixiang, Pu'er, Yunnan, 22°44'19''N, 101°07'01''E, alt. 1400m, 13.v.2012, ex tree trunks, J.J. Gao.

Distribution. China (Guangxi, Yunnan).

Etymology. A combination of the Latin words " niger " (= black) and " dentatus " (= dentate), referring to the aedeagus laterally with 4 small black teeth.