Dexia flavipes Coquillett, 1898

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 : 34-35

Dexia flavipes Coquillett, 1898

Figs. 37−40

Dexia flavipes Coquillett, 1898: 332 . — Mesnil 1980: 43 (redescription). — Herting 1984: 143 (list). — Shima 1989: 869 (list). — Herting & Dely-Draskovits 1993: 366 (catalog). — Richter 2004: 355 (key).

Eomyocera carinata of Baranov, 1952: 119, not Townsend, 1926, misidentification. — Herting 1984: 143 (as syn. of flavipes ).

Diagnosis. Palpus subequal in length to 1st flagellomereor; prementum 2−2.5 times as long as wide; 3 presutural and 3 postsutural dorsocentral setae; 2 katepisternal setae; legs reddish yellow; abdominal tergite 3 lacking black hind band.

Description. Body length. 9.8−12.0 mm.

Mesnil (1980) redescribed this species in detail. Here we give measurements and some additional characters.

Male. Head. Frons 0.14−0.16 times as wide as head width, parafacial 1.5−2.0 times as wide as 1st flagellomere; gena 0.42−0.43 times as wide as eye height. Inner vertical seta about 1/3 as long as eye height; ocellar seta about 1/2 eye height; fronto-orbital plate with only several fine short hairs among frontal setae. Antenna with1st flagellomere 2.5−3.5 times as long as pedicel; total width of arista including plumosity about 3 times as wide as 1st flagellomere. Prementum 2.0−2.5 times as long as wide; palpus slightly shorter than 1st flagellomere. Thorax black in ground color, postpronotal lobe and apex of scutellum reddish, with yellowish white pruinosity; scutum with 2 pairs of longitudinal black vittae, an inner vitta about 1/4 as wide as pruinose portion between inner and outer vittae; brownish gray pruinosity on basal 3/4 of scutellum. Prosternum usually bare, sometimes with 2−3 hairs on both sides; proepisternum bare. Wing Costal spine about as long as crossvein r-m; relative lengths of 2nd, 3rd and 4th costal sectors approximately 4.5:10:5.5; vein M from dmcu crossvein to its bend about 3 times distance between the bend and wing margin. Lower calypter with long fringe on outer margin. Legs reddish yellow. Mid tibia with 2 posterodorsal setae, hind tibia with 2−4 anterodorsal, 2 posterodorsal and 2−3 ventral setae. Abdomen. Hairs rather dense, fine and short; syntergite 1+2 with 5−6 lateral discal and 1−2 lateral marginal setae, without median marginal setae; tergite 3 lacking black posterior band, with 1−2 pairs of median discal, 1 pair of median marginal, and 2 lateral marginal setae, without lateral discal setae; tergite 4 with 1−2 pairs of median discal and a row of marginal setae; tergite 5 with an irregular row of discal setae. Male terminalia. Cerci slender on apical 1/2; surstylus narrow and slightly pointed apically; pregonite short; postgonite about as long as basiphallus; distiphallus long.

Female. Frons about 0.37 times as wide as head width; fronto-orbital plate 2.5−3.0 times as wide as frontal vitta; gena about 1/2 eye height. Inner vertical seta as strong as frontal setae; 5 frontal setae; 2 proclinate and 1 upwardly directed prevertical setae. Thorax with gray pruinosity; postpronotal lobe, postalar callus and distal scutellum yellow in ground color. Mid tibia with 1 posterodorsal seta; hind tibia with 2 anterodorsal, 1 posterodorsal, and 2 ventral setae. Abdomen ovate, black in ground color, with yellowish gray pruinosity on anterior 1/2−2/3 of tergites 3 to 5, without discal seta.

Type material examined. Holotype male of Dexia flavipes Coquillett , JAPAN, Gifu, 25.x.1890 ( USNM).

Additional material examined. CHINA. Hebei: 1 male, 2 females, Yangjiaping, 800 m, Xiaowutai Shan , 27.vi.2009, C. Fu and Y.-Y. Zhou. 4 males, 1 female, Haojiagou, 800 m, Xiaowutai Shan, 29.vi.2009, C. Fu and Y.-Y. Zhou ( SNU) . JAPAN. Hokkaido: 2 males, Toyotomi –cho, 30.vii−3.viii.1996, M. Sueyoshi & T. Tachi. Honshu: 1 male, Karuizawa, Nagahinata , Nagano, 12.vii.1962, H. Shima. 1 male, Azukisawa, Hokuryu town, 15.vi.1973, H. Kurahashi. 1 male, Mt. Iozen , Kaga , Ishikawa. 1 female, Tateoka, Kizukuri, Amori , 9.viii.1980, Sho Fukushi. 1 male, Karasawa Pass, Chino , Nagano, 31.viii.1996, M. Sueyoshi. 1 male, Ogawa, Okuwa vil ., Nagano, 2.vii.1996, T. Tachi. 1 male, Kamikuisiki vil., light , Yamanashi, 3.viii.1995, T. Tachi. 1 male, Mt. Kongou , Kinki , Osaka, 25.vii.1995, T. Tachi. 1 male, Hanase Pass, Kyauto city , Kyoto, 14.vii.1997, M. Sueyoshi. 1 female, Ichinose, Mt. Hakusan , Ishikawa, 14.x.1997, T. Nakamura. 1 female, Mt. Kakezu , Geihoku-t , Hiroshima, 17.vii.1998, T. Tachi. Shikoku: 1 male, Yura, Kumakogen, Kamiukena , Ehime Pref., 20.ix.1907, Malaise trap, E. Yamamoto. Kyushu: 2 females, Yutsubo and Shonai, Asono , Oita, 5.x.1996, R. Matsumoto. 3 males, 2 females, Shonai, Asono , Oita, 23.viii.1985, 21.vi.1995, 18.vii.1995 (all in BLKU) . Hokkaido: 1 male, Obihiro, Kushiro , 13.vii.1951, S. Takano ( CNC) .

Distribution. China * (Hebei), Japan (Hokkaido, Honshu, Shikoku, Kyushu).

Remarks. Eomyocera carinata Townsend was misidentified as a junior synonym of Dexia flavipes by Herting (1984: 143), following Baranov (1952: 119). Dexia flavipes is similar to D. gilva , but differs from it in having narrow frontal vitta, narrow pruinose portion between inner and outer vittae on scutum, and abdominal tergite 3 lacking black posterior band. We recognize this species as newly recorded from Hebei, China.