Stegana ( Steganina ) silvestrella Zhang & Chen

Stegana ( Steganina) silvestrella Zhang & Chen View in CoL , sp. nov.

( Figs. 13G, 13H View FIGURE 13 , 61 View FIGURE 61 )

Diagnosis. This species is similar to S. ( S.) flavipedes sp. nov. in the shape of male terminalia (Figs. 38, 61), but can be distinguished from the latter by having the pregonite blurry or absent ( Fig. 61C, D View FIGURE 61 ); the aedeagus with numerous minute, serrated processes distally ( Fig. 61C, D View FIGURE 61 ).

Description. Male and female: First flagellomere yellow. Clypeus yellow. Mesonotum brown medially, brownish yellow laterally ( Fig. 13G View FIGURE 13 ). Katepisternum yellowish ( Fig. 13H View FIGURE 13 ). Scutellum dark brown in male, brownish yellow in female, black near distal margin ( Fig. 13G View FIGURE 13 ). Halter mostly yellowish ( Fig. 13H View FIGURE 13 ). Fore femur with a row of 3 long setae on distal part of posteroventral surface. Abdominal tergites brown medially, yellow laterally ( Fig. 13G, H View FIGURE 13 ); sternites yellow, about 1.8 times as wide as long. Male terminalia ( Fig. 61 View FIGURE 61 ): Epandrium with ca. 9 setae on dorsal to posterior portions per side ( Fig. 61A View FIGURE 61 ). Surstylus with some setulae near distal margin, lacking serrated processes and pubescence ( Fig. 61A, B View FIGURE 61 ). Cercus with much pubescence ( Fig. 61A View FIGURE 61 ). Hypandrium roundly expanded anteromedially ( Fig. 61C, D View FIGURE 61 ). Aedeagus tubular, distally expanded and rounded, lacking pubescence ( Fig. 61C, D View FIGURE 61 ). Aedeagal sheath lacking serrated process ( Fig. 61C, D View FIGURE 61 ). Subepandrial sclerite slightly half-rounded ( Fig. 61G View FIGURE 61 ).

Measurements and indices. BL = 2.63 mm in holotype ( 2.80–3.40 in 2♀ paratypes), ThL = 1.33 mm ( 1.33 in ♀), WL = 2.13 mm (2.00– 2.47 in ♀), WW = 1.00 mm (1.00– 1.13 in ♀), arb = 4/3 (4–5/3–4), avd = 1.00 (0.80–1.14), adf = 1.25 (1.00–1.40), flw = 2.42 (2.01–2.50), FW/HW = 0.45 (0.39–0.53), ch/o = 0.09 (0.08–0.11), prorb = 1.38 (0.83–1.33), rcorb = 0.75 (0.50–0.78), vb = 0.67 (0.60–0.80), dcl = 0.46 (0.46–0.48), presctl = 0.72 (0.70–0.82), sctl = 2.34 (2.11–2.50), sterno = 0.80 (0.60–1.11), orbito = 2.67 (2.12–2.67), dcp = 0.28 (0.25–0.28), sctlp = 1.86 (1.75–2.50), C = 1.67 (1.56–2.00), 4c = 1.29 (1.13–1.50), 4v = 1.91 (1.43–2.01), 5x = 2.43 (2.01–2.60), ac = 10.02 (9.00–12.01), M = 0.76 (0.73–0.84), C3F = 0.59 (0.64–0.87).

Type materials. Holotype ♂ ( SCAU, No. 125657, DNA #2752), CHINA: Wangtianshu , Mengla, Yunnan, 21°36'09''N, 101°35'06''E, alt. 700m, 25.iv.2007, ex tree trunk, H.W. Chen. GoogleMaps Paratypes: 2♀ ( SCAU, Nos. 125658, 59, DNA #2562), Mengdong , Cangyuan, Yunnan, 23°10'08''N, 99°13'52''E, alt. 1320m, 10.v.2016, ex tree trunks, J. Huang, Y.L. Wang. GoogleMaps

Distribution. China ( Yunnan).

Etymology. From the Latin word " silvestris " (= arboreal), referring to the arboreal Steganina flies.