Stegana (Steganina) melanostigma, Chen, Xi-Peng & Chen, Hong-Wei, 2008

Chen, Xi-Peng & Chen, Hong-Wei, 2008, The Stegana coleoptrata species group (Diptera: Drosophilidae) from mainland China, Zootaxa 1891, pp. 55-65 : 62-63

Stegana (Steganina) melanostigma sp. nov.

( Figs 31–36 )

Specimens examined. Holotype ɗ (SCAU, No. 120301): CHINA – labeled “Mengyang, Xishuangbanna, Yunnan, 22°20' N, 100°51' E, 600 m, on tree trunk, 14.ix.2002, H.W. Chen”. Paratypes: CHINA: 9ɗ23Ψ (SCAU, 120302 -30; 1ɗ1Ψ, SEHU), same data as holotype; 5ɗ1Ψ (KIZ), Menglun, Xishuangbanna, Yunnan, 800 m, on tussock, 17.iv.2007, J.J. Gao and H.W. Chen.

Etymology. A combination of the Greek words “melas” + “stigma”, referring to the scutum with black patches.

Diagnosis. Face yellow, black on lower corners; clypeus and palpus entirely black; median flaps of hypandrium very developed, nearly quadrate, slightly concave medially ( Figs. 34, 35 ); aedeagus ventrobasally strongly sclerotized and expanded, apically curved ventrad ( Figs. 34, 35 ).

Description. Some characters commonly seen in S. arcygramma sp. nov. are not referred to in the following description. Male and female: Frons yellow, black below ocellar triangle, with 1 small brown patch on lower margin (above ptilinal fissure). Gena yellow, black on vibrissa corners. Katepisternum white-yellow on lower part, black on upper part. Scutellum dark brown, yellow on tip, with thin yellow stripes laterally. Foreleg femur with 6 suberect setae on distal part of ventral surface. Male terminalia: Epandrium with ca. 28 setae on dorsal to posterolateral portion per side ( Fig. 31 ). Gonopods strongly sclerotized at medial line, posterior margin slightly protruded medially, with 1 subacute projection ( Fig. 36 ).

Measurements. BL = 3.75 mm in holotype (range in 5ɗ and 5Ψ paratypes: 3.55–4.40); ThL = 2.15 mm (1.95–2.15); WL = 3.65 mm (3.80–4.30); WW = 1.50 mm (1.45–1.70). Indices: arb = 12/8 (12/8–13/9), avd = 0.75 (0.70–0.75), adf = 2.00 (1.90–2.28), flw = 2.44 (2.00–2.71), FW/HW = 0.36 (0.36–0.40), ch/o = 0.13 (0.13–0.14), prorb = 1.10 (1.07–1.13), rcorb = 0.90 (0.87–0.94), vb = 0.35 (0.35–0.38), dcl = 0.50 (0.48– 0.60), presctl = 0.67 (0.70–0.84), sctl = 1.48 (1.37–1.60), sterno = 0.86 (0.73–0.94), orbito = 2.25 (1.86–2.40), dcp = 0.19 (0.12–0.19), sctlp = 1.55 (1.45–1.65), C = 2.35 (2.09–2.71), 4c = 1.03 (1.00–1.18), 4v = 1.80 (1.66–2.14), 5x = 1.08 (1.07–1.21), ac = 10.33 (10.00–12.00), M = 0.47 (0.46–0.55), C3F = 0.81 (0.71–0.80).

Distribution. China (Yunnan).

Figures

FIGURES 31 – 36. Stegana (Steganina) melanostigma s p. nov., male genitalia: 31. epandrium, surstylus and cercus; 32. surstylus; 33. 10 th sternite; 34. hypandrium, paramere, aedeagus and aedeagal apodeme; 35. ditto; 36. gonopods (For orientation, abbreviations and scale lines see Figs. 1 – 6).