Dexia flavida ( Townsend, 1925 )

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 : 31-33

Dexia flavida ( Townsend, 1925)

Figs. 33−36

Phasiodexia flavida Townsend, 1925: 251 .

Dexia flavida: Crosskey 1976: 179 . — Zhang & Shima 2004: 54 (notes). — Zhang et al. 2004: 128 (list). — O’Hara et al. 2009: 28 (catalog).

Phasiodexia formosana Townsend, 1927: 284 . — Zhang & Shima 2004: 54 (as syn. of D. flavida )

Eomyocera obtusa Malloch, 1935: 588 . — Crosskey 1976: 178 (as syn. of D. flavida ).

Dexilla flavida: Crosskey 1967: 106 .

Dexilla formosana: Crosskey 1967: 106 .

Dexilla obtusa: Crosskey 1967: 106 .

Dexia formosensis: Crosskey 1976: 178 .

Diagnosis. Thoracic dorsum with 2 dark inner thoracic vittae merged to form a dark brown rectangular band on anterior 2/5 of postsutural scutum; abdominal tergites almost lacking pruinosity; tergite 3 without median discal setae; tergite 5 with sparse hairs on discal area.

Description. Body length. 7.0− 12.2 mm.

Male. Head with grayish white pruinosity, antenna and palpus reddish yellow, prementum brown. Frons 0.11−0.15 times as wide as head width; frontal vitta slightly narrower than fronto-orbital plate at middle; parafacial about twice as wide as 1st flagellomere at middle height; facial carina high; gena 0.3−0.4 times as high as eye height, lower margin of face not protruding forward. Inner vertical seta 0.3−0.36 times as long as eye height, finer and shorter than ocellar seta; 10−11 inclinate frontal setae; ocellar seta as strong as upper frontal setae; fronto-orbital plate and parafacial bare; vibrissa inserted slightly above level of lower margin of face. Antenna falling short of lower margin of face by about 1/2 length of 1st flagellomere; 1st flagellomere 3−4.5 times as long as pedicel; total width of arista including plumosity about 4 times as wide as 1st flagellomere. Prementum about 5 times as long as wide, longer than palpus; palpus about as long as antenna.

Thorax balck in ground color, postprontal lobe reddish yellow in ground color; supra-alar area and postalar callus brown to dark brown, with dense yellowish white pruinosity, 2 pairs of longitudinal black vittae on scutum, inner vitta 1/3−1/4 times as wide as pruinose portion between inner and outer vittae on presutural scutum, 2 inner vittae merged on anterior 2/5 of postsutural scutum forming a dark brown rectangular band; anterior portion of anepisternum just posterior to anterior spiracle, anterior 1/3 of katepisternum and anepimeron dark brown; scutellum black on base and yellow on distal 2/3. Prosternum about twice as long as wide; proepisternum bare; postprontal lobe with 2 setae; 1 presutural and 1−2 postsutural acrostichal setae; 2 presutural and 3 postsutural dorsocentral setae; 2 postsutural intra-alar setae; 2−3 supra-alar setae, if 3, then anterior one fine; katepisternal setae usually 3, rarely 2. Wing brownish, hyaline, tegula brownish black and basicosta brown to dark brown; lower calypter brownish yellow; halter yellow. Costal spine small, shorter than 1/2 length of crossvein r-m; relative lengths of 2nd, 3rd and 4th costal sectors approximately 3.5:7.0:3.0; M appendix slightly shorter than r-m crossvein; vein M from its bend to wing margin about 4 times distance between the bend and crossvein r-m. Lower calypter with short fringe on outer margin. Legs yellow except black tarsi; mid tibia with 2 posterodorsal setae; hind tibia with 2 anterodorsal, 2 posterodorsal and 2 ventral setae.

Abdomen long ovate, broadly translucent yellow, dark brown on mid-dorsal longitudinal portion, anterior and posterior margin of syntergite 1+2, posterior 1/5 of tergites 3 and posterior 1/3 of tergite 4; tegite 5 usually reddish yellow, with a pair of brown subcircular lateral spots on posterior 1/2; dorsum almost without pruinosity. Hairs dense erect black on tergites 2 to 4, sparse and fine on tergite 5; syntergite 1+2 with 1 lateral marginal seta, without median marginal setae; tergites 3 without discal setae, with a row of 6−8 marginal setae; tergite 4 with 0−1 pair of discal setae and a row of marginal setae; tergite 5 with 1−2 pairs of discal setae and a row of marginal setae. Male terminalia. Cerci slender on apical half, pointed apically; surstylus narrow and slightly rounded at apex; postgonite shorter than basiphallus.

Female. Frons about 0.3 times as wide as head width; fronto-orbital plate with sparse fine black hairs on upper portion; gena 0.42−0.43 times as high as eye height; 4−7 inclinate frontal setae; 2 proclinate orbital setae; 1 reclinate orbital seta. Abdomen ovate, tergite 3 with a large triangular black marking extending to lateral margin of posterior portion; tergites 4 and 5 each with a dark marking and 2 brown lateral markings; abdomen with recumbent hairs, without discal seta; tergite 5 with median marginal setae shifted forward. Other characters almost same as in male.

Type material examined. Holotype female of Eomyocera obtusa Malloch , Pahang, Kuala Teku 300', in Beluka, MALAYSIA, 3.xii. 1921, H.M. Pendlebury ( BMNH) . Holotype male of Phasiodexia flavida Townsend , INDONESIA, Sumatra, Fort de Kock [= Bukittinggi], 920 m, v.1924, E. Jacobson ( RMNH) . Paratype female, MALAYSIA, Pahang, Kuala Teku 300' in Beluka , 3.xii.1921, H.M. Pendlebury ( BMNH) . Holotype female of Phasiodexia formosana Townsend , Formosa [= Taiwan], Nantou Hsien, Toa Tsui Kutsu [= Chitou], v.1914, H. Sauter ( DEI) .

Additional material examined. CHINA. Anhui: 1 female, Mt. Huo, Foziling, 29.ix.1964, G.-T. Jin ( SEMC) . Fujian: 1 female, Guangze, Siqian , 5.v.1960 . 1 male, Wuyi Shan , 24.ix.1982 . 1 male, 1 female, Chongan, Xing village , 22.v.1960, 17.vi.1960 . 1 female, Chongan, Mt. Huanggang, Daan , 3.vii.1960 . 1 female, Chongan, Genmu , 790−1155 m, 29.vi.1960 . 2 females, Chongan, Chengguan , 22.v.1960, all by G.-T. Jin, Y.-M. Lin ( SEMC) . Guizhou: 2 females, Fanjing Shan , 1200 m, 10.ix.1993, Y.-S. Cui and H.-W. Chen. Hainan : 10 males, Mt. Jianfengling , 500−950 m, 20.v.1993, 19−20.v.2004, Y.-S. Cui, C.-T. Zhang ( SNU) . Jiangxi: 1 male, Kuling (= Lu Shan ), 4.vi.1926, C.-Y. Wong . 1 male, Shaowu, Taohulan , 1000 m, 1−3.vi.1943, T. Maa ( BPBM) . 1 male, Guling (= Lu Shan ), 27.viii.1935, Musé Houde ( SYU) . Shaanxi: 1 male, Taibai Shan, Gaoping , 980 m, 1.ix.1992, Y.-S. Cui ( SNU) . Sichuan: 5 males, Jiulaodong, Emei Shan , 1300−1900 m, 22−27.vii.1957 and 5−14.viii.1957, K.-R. Huang, Y. Yu, Z.-Y. Wang, Y.-C. Lu . 2 males, Xixiangchi, 1800−2000 m, Emei Shan , 14−19.viii.1957, F.-X. Zhu, K.-R. Huang ( IZCAS) . Xizang: 4 males, Chuona , 26−30.vi.1977, J.-Y. Wu ( SEMC) . Yunnan: 1 female, Laowo, 2000−2400 m, Nujiang , 4−5.ix.1996, H. Shima . 1 female, 15 km S., 1200 m, Simao , 21.x.1989, H. Shima ( BLKU) . 1 female, Gaoligong Shan , 2500 m, 17.vii.2008, S.-C. Bai ( SNU) . Zhejiang: 4 males, 1 female, Tianmu Shan , 29.viii−11.ix.1947 . 1 male, Longqi Shan, Lishan , 21.v.1991, Y.-S. Shi ( IZCAS) . INDIA. 2 males, Musore, UP, 7500 ft, 18.vi.1944, D.E. Hardy ( USNM) . INDONESIA. 1 male, Noongan, 50 km S. of Menado , 1200 m, Sulawesi, 2−10.xii.1973, H. Kurahashi . MALAYSIA. 1 female, Mt. Kinabalu , moss forest, Sabah, 1−2.v.1979, H. Kurahashi ( BLKU) . 1 male, Pahang Tanah Rate , 1480 m, 10.i.1990, J.R. Vockeroth ( CNC) . NEPAL. 3 females, Bogara , 1700−2200 m, 19−20.ix.1971, A. Nakanishi . 1 female, Dobang Kharka , 2400 m, 13.x.1972, A. Nakanishi . 1 males, 1 female, Basantapur , 2300 m, 26−28.vii.1972, H. Shima and H. Makihara . 1 male, Jiri to Bhandar, Ramaechap Dist. , 1950−2194 m, 25.vii.1992, H. Kurahashi . 1 male, Narayani, Kathmandu to Bhandar, Tistung , 2030 m, 8.viii.1992, H. Kurahashi . 1 female, Bagmati, Kathmandu town , 1300 m, 28.ix.1990, H. Kurahashi . 3 females, Rolwaling valley, Ketang Cave to Simigaon , 2150−2650 m, 22.x.1992, M. Iwasa ( BLKU) . 1 male, Thankot , 4.v.1980, Amnon Freidberg . VIETNAM. 1 female, 15 km NW of Dalat , 1850 m, 5.v.1960, L.W. Quate ( BPBM) .

Distribution. China (Anhui, Fujian, Guizhou, Hainan, Jiangxi, Shaanxi, Sichuan, Taiwan, Xizang Yunnan, Zhejiang), India *, Indonesia (Java, Sumatra, Sulawesi), Malaysia (Pen. Malaysia), Myanmar, Nepal *, Vietnam *.

Remarks. This species is close to D. divergens , but differs from it in having merged inner vittae on anterior 2/5 of postsutural scutum, abdominal tergite 3 without median discal setae, and tergite 5 with sparse hairs on discal area.