Dexia gilva Mesnil, 1980

Zhang, Chun-Tian, Shima, Hiroshi & Chen, Xiao-Lin, 2010, A review of the genus Dexia Meigen in the Palearctic and Oriental Regions (Diptera: Tachinidae) 2705, Zootaxa 2705, pp. 1-81 : 41-43

Dexia gilva Mesnil, 1980

Figs. 45−48

Dexia (Eomyocera) gilva Mesnil, 1980: 44 . — Herting 1984: 143 (catalog). — Shima 1989: 869 (list). — Herting & Dely-Draskovits 1993: 366 (catalog). — Chao et al. 2002: 832 (note). — Zhang et al. 2004: 128 (list). — O’Hara et al. 2009: 29 (catalog).

Dexia subflava Zhang, Pang & Chao, 2005: 304 . Nomen nudum.

Diagnosis. Palpus subequal in length to 1st flagellomere or shorter; prementum 2.5−3 times as long as wide; thoracic inner black longitudinal vitta 0.3−0.5 as wide as pruinose portion between inner and outer vittae; 3 presutural and 3 postsutural dorsocentral setae; 2 katepisternal setae; and legs reddish yellow.

Description. Mesnil (1980) described this species in detail. We add here measurements and some diagnostic features.

Body length. 8.0−13.0 mm.

Male. Head: Frons 0.13−0.18 times as wide as head width, facial carina weakly developed; parafacial about twice as wide as 1st flagellomere; gena 0.4−0.5 times as wide as eye height. Inner vertical seta 0.25−0.36 times as long as eye height; 9−10 inclinate frontal setae as long as ocellar seta, longer than inner vertical seta. 1st flagellomere 2.5−3 times as long as pedicel. Prementum 2.5−3 times as long as wide; palpus at most as long as 1st flagellomere. Thorax black, with yellowish pruinosity, with 4 longitudinal black vittae on dorsum, an inner vitta 0.3−0.5 times as wide as pruinose portion between inner and outer vittae; scutellum black, with yellowish pruinosity. Proepisternum bare, postpronotal lobe with 2 strong setae; 2 presutural and 3 postsutural dorsocentral setae; 2−3 supra-alar setae, anterior one strongest; 2 katepisternal setae. Wing hyaline, brownish, tegula and basicosta reddish to dark brown; costal spine as long as crossvein r-m; relative lengths of 2nd, 3rd and 4th costal sectors approximately 1:2:1. Lower calypter with long fringe on outer margin. Legs yellow; mid tibia with 1−2 posterodorsal setae; hind tibia with 2−3 anterodorsal, 2−3 posterodorsal and 2 ventral setae. Abdomen translucent yellow, broadly black on mid longitudinal portion and posterior margin of tergites (sometimes reddish yellow); grayish white pruinosity on anterior 1/5−1/3 of tergite 3, 1/4−1/2 of tergite 4 and 1/2−3/5 of tergite 5. Syntergite 1+2 with 1−3 lateral marginal setae, without median marginal setae; tergite 3 with 1−2 pairs of discal setae, 1 pair of median marginal and 1−3 lateral marginal setae; tergite 4 with 1−2 pairs of discal setae; tergite 5 with a row of discal setae. Male terminalia. Cerci slender and slightly pointed apically; surstylus short, narrow and pointed apically; postgonite slightly shorter than basiphallus.

Female. Frons 1/3−2/5 times as wide as head width; parafacial 3−4 times as wide as 1st flagellomere; gena about 1/2 eye height; 4−5 inclinate frontal setae; 2 strong proclinate and 1 reclinate orbital setae; latter about as long as ocellar seta; outer vertical setae about 1/2 as long as inner vertical seta. Thorax with yellowish gray pruinosity. Wing brown, vein M with short appendage at bend. Mid tibia with 2−3 posterodorsal setae; hind tibia with 2−4 anterodorsal, 2 posterior and 1−2 ventral setae. Abdomen reddish yellow, anterior and posterior portion of synternite 1+2 dark brown; median portion reddish brown, gleaming black on posterior 2/3−4/5 of tergite 3; 1/2−3/5 of tergites 4 and 5; gray pruinosity on anterior 1/4 of tergite 3, 1/2−2/3 on tergites 4 and 5; tergites without regular discal setae.

Type material examined. Holotype male of Dexia gilva Mesnil, Shinmura, Amami-Oshima, Ryukyu Islands , JAPAN, 5.xi.1966, T. Okuno ( BLKU) . Paratypes. JAPAN: 13 males, Amami-Oshima and Tokunoshima Islands, xi.1966, T. Okuno ( BLKU) .

Other material examined. CHINA. Anhui: 1 male, Mt. Mei , 21.vii.1964, G.-T. Jin . 6 males, 2 females, Huoshan, Foziling , 11−23.ix.1964, G.-T. Jin . 1 male, Huoshan, Dahuaping , 4.ix.1964, G.-T. Jin ( SEMC) . Guangxi: 1 female, Maoer Shan, 1200 m, 15−18.v.2004, M.-F. Wang ( SNU) . Hubei: 1 male, Songluo, 900 m, Shennengjia , 14.vi.1981, Y.-H. Han . Sichuan: 1 male, Emei Shan , 6.vi.1955, K.-R. Huang ( IZCAS) . 1 male, 1 female, Emei Shan, Jingshui, 700 m, 15.viii.1998, T. Saigusa. 2 males, 2 females, Tianquan Xian, 1100−1200 m, 30.viii.1993, X. Liang. 1 female, Erdaogou, 1690 m, Nanping , 2.viii.1993, H. Shima ( BLKU) . 1 male, Zhongjiang , 27.x.1981, X.-S. Li ( SEMC) . 2 males, Erlang Shan, 1100−2100 m, Luding , 18.vii.2006, J.-Y. Liu ( SNU) . Xizang: 1 male, Xiaojilong, 2800 m, Jilong , 27.vii.1975, Z. Wang ( IZCAS) . 5 males, 6−25.iv.1980, G.-T. Jin, J.-Y. Wu. 6 males, Linzi , 9.vii.1977, J.-Y. Wu . 1 male, Beibeng , 28.vii.1977, J.-Y. Wu . 1 male, Lang Xian , 8.vii.1977, J.-Y. Wu . Yunnan: 1 female, Haishuihe, 2700m, Lijiang , 28.viii.1996, H. Shima ( BLKU) . 1 male, Liude, 2400 m, Yongsheng , 8.viii.1984, S.-Y. Wang ( IZCAS) . Zhejiang: 1 male, 1 female, Taishun , 29.vi.1963, G.-T. Jin . 1 male, Tianmu Shan , 8.v.1963, G.-T. Jin . 1 male, 1 female, Mt. Yandang , 11−18.vi.1963, G.-T. Jin ( SEMC) . JAPAN. Okinawa: 2 males, Asahiga-Oka, Tokunoshima, Ryukyu , 7.xi.1966 , T. Okuno leg. 1 female, Mt. Inokawa, Tokunoshima , 10.xi.1971, S. Shinonaga . 1 male, Izumi , 29.vi.1982, K. Ohara . 1 male, Yoma , 21.x.1994, R. M. Ryukyus : 1 female, Uragani, Amami-Oshima Is., 30.x.1966, T. Okuno. 1 male, Amami Is. , 16.iv.1967, K. Honda . 2 males, 2 females, Yuwan dake, Amami- Oshima , 22−25.iv.1996, T. Tachi . 2 males, 2 females, Tete, Inokawadake, Tokunshima , 24.iv.1996 and 28−30.iv.1996, M. Sueyoshi and R, Matsumoto ( BLKU) . 1 female, Amami Oshima I., Naze city, 14.vii.1963 . 1 female, Amami Oshima I., Yuwan-dake , 10−300 m, 29.vii.1963, Malaise Trap, J. L. Gressitt . 1 male, Okinawa I., Hentona , 25.iii.1964, C.S. Yoshimoto ( BPBM) . VIETNAM. 1 female, Sapa 1500 m, Laocai , 13.v.1995, Y. Nishikawa . 1 male, Lai Chau, Mt. Phang , Si Pang, N. ridg., 1970 m, 4.x.1995, H. Kurahashi . 5 males, 3 females, Sapa, 1700 m, Lao Cai Prov., 26−30.v.1997, R. Matsumoto . 1 male, 1 female, same locality as previous, 20.vi.1999, M.S . 2 males, Lao Cai Prov., nr. Sapa Deo Tram Ton , 1950 m, 27−29.vi.1997, 31.v.1999, H. Kurahashi ( BLKU) .

Distribution. China (Anhui, Guangxi, Hubei, Sichuan, Xizang, Yunnan, Zhejiang); Japan (Ryukyus), Vietnam.

Remarks. Dexia gilva is similar to D. flavipes from Japan, but differs from it in having wider frontal vitta, 3 supra-alar setae, inner thoracic vitta about 1/2 as wide as pruinose portion between inner and outer vittae, and reddish to dark brown tegula.