Dexia flavida
Creators: name: Zhang, Chun-Tian
name: Shima, Hiroshi
name: Chen, Xiao-Lin
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Tachinidae
Dexia
Dexia flavida

description: 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.
description: Published as part of 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, pp. 1-81 in Zootaxa 2705 on pages 31-33