Parerigone wangi, Wang, Qiang, Zhang, Chuntian & Wang, Xinhua, 2015

Wang, Qiang, Zhang, Chuntian & Wang, Xinhua, 2015, Review of the genus Parerigone Brauer (Diptera: Tachinidae) with five new species from China, Zootaxa 3919 (3), pp. 457-478 : 470-473

Parerigone wangi sp. nov.

( Figs. 17–20 , 37–40 )

Diagnosis. Medium-sized black flies, mostly covered with yellow or yellowish pruinosity. Vertex about 0.27 of head width; male with 1 strong reclinate orbital seta; palpus reddish; discal scutellar seta absent; legs black, mid tibia with 1 anterodorsal seta, without ventral seta.

Description. Body length: 9.0 mm.

Male. Head black in ground color, reddish on parafacial obliquely from upper anterior margin to lower eye margin and gena, fronto-orbital plate brown to black, frontal vitta reddish brown to black, genal dilation reddish brown, lower face pale yellowish; fronto-orbital plate, parafacial, face, gena and genal dilation covered with grayish white pruinosity, occiput with yellowish white hairs and one row of short black hairs behind postocular seta; antenna brown-black; palpus reddish yellow, darkened on basal 1/6. Vertex about 0.27 of head width; frontal vitta about 0.7 times as wide as fronto-orbital plate at middle; parafacial about 1.2 times as wide as 1st flagellomere at middle height; face weakly concave, lower margin slightly protruded forward, extending beyond base of vibrissa by about 0.5 times of pedicel; gena about 0.4 times of eye height. Inner vertical seta long, about 0.85 times of eye height; outer vertical seta fine, about 0.52 times as long as inner vertical seta; ocellar seta hair-like, about 0.4 times as long as inner vertical seta and with several fine black hairs on ocellar triangle; 2 postocellar setae, about 0.42 times as long as inner vertical seta; 2 post vertical setae, about 0.4 times as long as inner vertical seta; 8 long strong frontal setae, lowest seta nearly level with basal of pedicel; fronto-orbital plate with only several fine short black hairs among and beyond the row of frontal setae; 1 strong reclinate orbital seta, about 0.6 times as long as inner vertical seta; vibrissa inserted slightly above level of lower margin of face; facial ridge with 4–5 setae and several fine short hairs at most on its lower 2/5; 3–5 rather long subvibrissal setae. Antenna falling short of lower margin of face by about twice pedicel length; pedicel bearing black hairs and a long seta, the latter about 2.0 times as long as pedicel; 1st flagellomere about 3.0 times as long pedicel; arista with microscopic pubescence, 3rd aristomere thickened on basal 2/7.

Thorax black in ground color, with yellowish pruinosity; dorsum with 4 narrow longitudinal vittae, outer vittae about twice as wide as inner vittae and about 0.4 times as wide as pruinose portion between inner and outer vittae; pleura with grayish white pruinosity. All thoracic hairs black, fine short and suberect; anatergite with fine hairs; 3 presutural and 3 postsutural dorsocentral setae; scutellum with 3 pairs of marginal setae, discal setae absent, basal and subapical setae subequal in length and about 2.0 times as long as scutellum, apical seta shorter than basal and subapical setae and about 1.4 times as long as scutellum, sometimes 1 rather fine hair inserted before basal seta.

Wing hyaline, evenly and weakly tinged with pale yellow on basal and anterior margins; basicosta dark brown; lower calypter pale yellowish white on middle and pale yellowish on margin. Costa between subcosta and vein R1 about 0.33 times as long as that between R1 and R2+3; bend of vein M rather obtuse angled, vein M from dm-cu crossvein to its bend about 1.50 times as long as distance between the bend and wing margin extending along vein M.

Legs black, claws reddish brown, pulvilli pale yellowish brown. All leg hairs black; fore tibia with 2 very fine anterodorsal and 2 fine and long posterior setae; mid tibia with 1 anterodorsal and 2 posterodorsal setae, without ventral seta; hind tibia with a sparsely set row of short and fine anterodorsal setae, 3–4 strong submedian setae among them, if 4 setae present then upper seta fine, 2 posterodorsal setae and 2 strong anteroventral setae, and with 2 preapical dorsal setae.

Abdomen long ovate, black in ground color, entirely covered with yellow pruinosity, irregular spots appearing with direction of light on dorsum of syntergite 1+2 to 5th tergite. Hairs on dorsum black, fine and short; syntergite 1+2 excaved half way to posterior margin, with 2–3 lateral marginal setae; 3rd tergite with 2 strong median discal, 2 strong median marginal and 2 lateral marginal setae; 4th tergite with 2 strong median discal and a row of 10–12 strong marginal setae; 5th tergite with 2 rows of median discal and a row of marginal setae.

Male terminalia. Fifth sternite ( Fig. 39 ) broadly U-shaped in ventral view, broadly excavated posteromedially, without membranous area anterior to the excavation, inner lateral margin obtuse, with fine hairs on posterior lobe; cerci ( Fig. 37 ) broadly inflated in dorsal view, narrowly separated on basal 1/3 to apex, lateral margin expanded from middle to apex, pointed apically, with dense short hairs, in lateral view dorsal margin nearly straight and ventral margin strongly bulged, apex strongly concave, with dense and short hairs; surstylus ( Fig. 38 ) long, strongly inwardly concave near middle and strongly bulged on basal 1/3 to apex, rather rounded apically, with fine hairs on basal 1/5; bacilliform sclerite very short; pregonite nearly straight from posterior to apex; postgonite overlapping pregonite on basal 2/3; distiphallus elongate, distal area expanded laterally; ejaculatory apodeme short, nearly dumbbell-shaped ( Fig. 40 ).

Female. Unknown.

Holotype male, Mt. Taibai, Zhouzhi, 1500 m, Shaanxi, China, 9-16.vi.1989, M.F. Wang (SYNU).

Etymology. Specific name is taken from the collector, Prof. Mingfu Wang, for his taxonomic contributions to Calyptratae of China.

Remarks. Parerigone wangi is one of three species in the genus with 3 pairs of scutellar marginal setae, 3 postsutural acrostichal setae and the vertex more than 1/5 of head width, the other species being P. takanoi and P. laxifrons . Within this group of three species, P. wangi and P. takanoi have a reddish yellow palpus. Parerigone wangi differs from P. takanoi in having a wider vertex, male with 1 strong reclinate orbital seta, and discal scutellar setae absent.

Distribution. China (Shaanxi).

Figures

FIGURES 17 – 20. Parerigone wangi sp. nov., male. 17. Body in dorsal view. 18. Body in lateral view. 19. Head in lateral view. 20. Head in anterior view.

FIGURES 37 – 40. Male terminalia of Parerigone wangi sp. nov. 37 – 38. Epandrium, cerci and surstyli. 37. Caudal view. 38. Lateral view. 39. Sternite 5 in ventral view. 40. Aedeagal apodeme, ejaculatory apodeme, hypandrium, pregonite, postgonite, basiphallus, distiphallus in lateral view. Scale bars = 0. 25 mm.