A review of the genus Dexia Meigen in the Palearctic and Oriental Regions (Diptera: Tachinidae) 2705 Author Zhang, Chun-Tian Author Shima, Hiroshi Author Chen, Xiao-Lin text Zootaxa 2010 2010-12-03 2705 1 81 journal article 1175­5334 Dexia tenuiforceps Zhang et Shima , sp . nov . Figs. 81−84 Diagnosis. Prementum 5−6 times as long as wide; 3 katepisternal setae; tegula mostly black except reddish brown base; legs reddish yellow; abdominal syntergite 1+2 with 1 pair of median marginal setae; and surstylus narrow and bent. Description. Body length. 10.0−15.0 mm. Male . Head with yellowish gray pruinosity, frontal vitta brownish black, lunule brown; antennae and palpi reddish yellow. Frons 1/6−1/7 as wide as head width; fronto-orbital plate slightly wider than or subequal in width to frontal vitta at middle; parafacial 2.5−3 times as wide as 1st flagellomere; facial carina developed, ridge arched in lateral view, widened below; lower margin of face protruding forward; gena about 3/7 as wide as eye height. Inner vertical seta 0.27−0.4 times as long as eye height, about twice as long as fine, hair-like, outer vertical seta; ocellar seta as strong as upper frontal setae; 12−13 inclinate frontal setae; vibrissa inserted above lower margin of face. Antenna falling short of lower margin of face by 0.6−0.7 times length of 1st flagellomere, latter about 4 times as long as pedicel; total width of arista including plumosity about 4 times as wide as 1st flagellomere. Prementum 5−6 times as long as wide; palpus slightly longer than antenna. Thorax black in ground color, with grayish yellow pruinosity, 4 longitudinal black vittae on presutural area of scutum and 5 on postsutural scutum, an inner vitta 0.4−0.5 times as wide as pruinose portion between inner and outer vittae on presutural area. All thoracic hairs black; prosternum bare, twice as long as wide; proepisternum bare; 1−2 presutural and 2 postsutural acrostichal setae; 3 presutural and 3 postsutural dorsocentral setae; 2 postsutural intra-alar setae; 3 supra-alar setae, anterior seta about 1/2 as long as posterior two; 3 katepisternal setae. Wing brownish hyaline; basicosta black; tegula mostly black except reddish brown base; lower calypter yellowish, with short fringe on outer margin. Costal spine distinct, about as long as r-m crossvein; relative lengths of 2nd, 3rd and 4th costal sectors approximately 1:2:1; vein M from dm-cu crossvein to its bend 2.5−3.3 times distance between the bend and wing margin, appendix very short. Legs reddish yellow except for dark brown tarsi and brown ventrodistal portions of femora. Mid tibia with 2 posterodorsal setae; hind tibia with 1−3 anterodorsal, 2−3 posterodorsal and 2 ventral setae. Fore claw and pulvillus slightly longer than, or subequal in length to, tarsomere 5. Abdomen long ovate, translucent yellow, black on mid-dorsal longitudinal areas and on posterior 1/4−1/5 of tergites 4 and 5, black marking on bases of lateral marginal setae of each tergites; grayish white pruinosity on narrow anterior margin of tergites 3, anterior 1/4−4/5 of tergite 4 and entire tergite 5. Syntergite 1+2 with 2 median marginal and 1 lateral marginal setae; tergite 3 with 1−2 pairs of median discal, 1 pair of median marginal and 1 lateral marginal setae; tergite 4 with 1−2 pairs of discal and a row of marginal setae; tergite 5 with a row of discal and marginal setae. Male terminalia . Sternite 5 subsquare, V-shapedmedian cleft about 3/5 length of the sternite, posterior lobe wide and blunt apically; cerci slender on apical half and pointed apically; surstylus narrow and slender, pointed apically; postgonite shorter than basiphallus. Female . Frons 0.28−0.33 times as wide as head width; frontal vitta slightly narrower than fronto-orbital plate at middle; 1st flagellomere about 5 times as long as pedicel. Tegula and basicosta brown to dark brown. Legs wholly yellow; claws and pulvilli short. Abdomen ovate; reddish yellow; tergites 4 and anterior half of tergite 5 black, with gray pruinosity; abdominal syntergite 1+2 without median marginal setae, tergites 3 and 4 without discal setae. Other characters almost same as in male. FIGURES 81–84. Dexia tenuiforceps sp . nov . 81–82 . Epandrium, cerci and surstyli in dorsal and lateral views. 83 . Aedeagal apodeme, ejaculatory apodeme, hypandrium, pregonite, postgonite, basiphallus, and distiphallus in lateral view. 84 . Sternite 5. Scale bars = 0.25 mm. Type material. Holotype male, CHINA . Yongsheng , Liude , 2300 m , Yunnan , 10.vii.1984 , R. Wang ( IZCAS ) . Paratypes . CHINA . Fujian (= Fukien ): 1 male , Shaowu , Taohulan , 1000 m , 14−18.vii.1946 , T. Maa . 2 males , Chungan , Kuatun , 22−25.viii.1945 , T.C. Maa ( BPBM ) . Sichuan (= Szechuen ): 1 male , Emei Shan , Xixiangchi , 1800−2100 m , 28.viii.1957 , K.-R. Huang . 1 male , 1 female , Moxi , 1500−2400 m , Luding , 15- 18.ix.1982 , X.-Z. Zhang ( IZCAS ) . 1 male , 1 female , Mt. Omei [= Emei Shan], 4000−7 000 ft, 16−22.viii.1934 , D.C. Graham ( USNM ) . 4 males , Hongkou , Dujiangyan , Chengdu , 12–13.viii.2009 , C.-T. Zhang , C. Fu , Z. Zhao ( SNU ) . Yunnan : 1 male , Xishan , 2100 m , Kunming , 17.viii.1996 , H. Shima . 1 female , Dagaoping , 1900−2400 m , Baoshan , 7−9.ix.1996 , H. Shima . 2 females , Laowo , 2000−2400 m , Nujiang , 4−5.iv.1996 , H. Shima ( BLKU ) . 28 males , 1 female , Wuliang Shan , 2800 m , Jingdong , Simao , 8−9.vi.2010 , C. FU & Y.-Y. Zhou . 7 males , 1 female , Cang Shan , 2700 m , Dali , 11.vi.2010 , C. FU & Y.-Y. Zhou . 1 male , Gaoligong Shan , 2400 m , Pianma , Lushui , 22.vi.2010 , Y.-Y. Zhou . 2 females , Xi Shan , 1950-2350 m , Kunming , 27.vii.2010 , C.-T. Zhang , Q. Wang . 1 female , Gaoligong Shan , 2400 m , Xujiaping , Lushui , 14.viii.2010 , Q. Wang ( SNU ) . Xizang : 1 male , Médog , 17.viii.1977 , G.-T. Jin. Zhejiang : 7 males , Baishanzu , 1080−1200 m , Qingyuan , 23−26.vii.1963 , G.-T. Jin ( SEMC ) . Taiwan : 1 male , Taihezan , 1960, Baranov ( USNM ) . NEPAL . 6 males , 2 females , Basantapur , 2300 m , E. Nepal , 25−26.vii.1972 , H. Shima . 1 male , Ramaechap Dist. Jiri, 1950 m , 24.vii.1992 , H. Kurahashi . 1 female , Solukhumbu , Bandar-Sete , 2150−2575 m , 26.vii.1992 , H. Shima ( BLKU ) . 1 male , Ktmd. [= Kathmandu], Pulchauki , 6600 ft , viii.1967 , Malaise trap ( CNC ) . Etymology. The specific epithet is taked from a diagnostic character of this species, the narrow surstylus. Distribution. China ( Fujian , Sichuan , Taiwan , Yunnan, Zhejiang), Nepal . Remarks. This species is similar to D . fraseri , but differs from it by 1st flagellomere and prementum longer, basicosta dark, and wing brownish hyaline, not strongly tinged brown along veins and anterior portion.