Stegana (Steganina) idiasta Cui & Chen, sp. nov.

(Figs. 9I, 9J, 42D–F)

Diagnosis. This species is similar to S. (S.) curvitabulata sp. nov. in the shape of epiproct, cercus (Figs. 35A, 42D), and hypoproct (Figs. 35C, 42F), but can be distinguished from the latter by having the palpus large, mostly yellow, distally slightly grey (Fig. 9J); the epiproct lacking sensilla, with some setae on distal 2/3 (Fig. 42D); the 8th sternite not curlied laterally, glabrous on basal 2/3, with several short setae and some pubescence on distal 1/3 (Fig. 42E).

Description. Female: First flagellomere brownish. Clypeus yellow. Mesonotum brownish yellow medially, yellow laterally (Fig. 9I). Katepisternum yellowish (Fig. 9J). Scutellum brownish yellow medially, brown laterally (Fig. 9I). Halter mostly grey (Fig. 9J). Fore femur with a row of 3 long setae on distal part of posteroventral surface. Abdominal tergites dark brown (Fig. 9I, J); sternites brown, about 2 times as wide as long. Female terminalia (Fig. 42D–F): Cercus and hypoproct with numerous setae and much pubescence (Fig. 42D, F).

Measurements and indices. BL = 3.15 mm in holotype (2.87–3.68 in 2♀ paratypes), ThL = 1.57 mm (1.49– 1.56), WL = 2.63 mm (2.88–3.08), WW = 1.21 mm (1.17–1.26), arb = 7/4 (7/4–5), avd = 0.78 (0.80–0.86), adf = 1.51 (1.17–1.24), flw = 2.92 (2.54–2.67), FW/HW = 0.35 (0.36–0.38), ch/o = 0.18 (0.21–0.22), prorb = 1.04 (0.78–0.89), rcorb = 0.88 (0.66–0.68), vb = 0.88 (0.77–0.93), dcl = 0.41 (0.50–0.54), presctl = 0.53 (0.46–0.59), sctl = damaged (1.80–1.89), sterno = 0.90 (0.78–0.82), orbito = 2.00 (1.66–1.82), dcp = 0.34 (0.34–0.40), sctlp = 1.87 (1.61–2.00), C = 1.71 (1.70–1.73), 4c = 1.36 (1.26–1.30), 4v = 1.95 (1.86–1.89), 5x = 1.21 (1.56–1.91), ac = 13.25 (19.33–23.60), M = 0.65 (0.62–0.66), C3F = 0.66 (0.61–0.62).

Type materials. Holotype ♀ (SCAU, No. 125784, DNA #2189), Yixiang, Pu'er, Yunnan, 22°44'19''N, 101°07'01''E, alt. 1400m, 13.v.2012, ex tree trunk, H.W. Chen . Paratypes: 2♀ (SCAU, Nos. 125785, 86, DNA #2761, 2762), other data same as holotype.

Distribution. China (Yunnan).

Etymology. From the Greek word " idiastçs " (= hermit), referring to the Steganina flies being reclusive in the forest.