Parerigone flava, 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 : 463-465

Parerigone flava sp. nov.

( Figs. 5–8 , 25–28 , 42 )

Diagnosis. Body broad, mostly covered with dense yellow pruinosity. Vertex 0.20–0.23 (male), 0.3 (female) of head width; thoracic hairs yellow mixed with several black hairs; scutellum with 5–6 pairs of marginal setae; abdomen broadly reddish yellow in ground color, with black hairs dorsally except yellowish hairs laterally and ventrally; legs broadly reddish yellow.

Description. Body length: 9.5–11 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 pale yellow or yellowish white hairs and 2–3 short black hairs behind postocular setae, covered with yellowish white pruinosity; antenna brown-black, basal 1/8 of 1st flagellomere, base 1/6 of pedicel and base 1/8 of scape reddish brown; palpus reddish yellow. Vertex 0.20–0.23 of head width; frontal vitta 1.6–1.8 times as wide as fronto-orbital plate at middle; parafacial 0.8–0.9 times as wide as 1st flagellomere at middle height; face weakly concave, lower margin slightly protruded forward, extending beyond base of vibrissa by 0.7–1.0 times of pedicel; gena 0.32–0.34 of eye height. Inner vertical seta long, 0.73–0.75 times of eye height; ocellar seta fine, 0.45–0.50 times as long as inner vertical seta and several fine black hairs on ocellar triangle; 2 postocellar setae, 0.55–0.60 times as long as inner vertical seta; 2 post vertical setae, 0.33–0.35 times as long as inner vertical seta; 9–10 long frontal setae, lowest seta nearly level with middle of pedicel; fronto-orbital plate with only several fine black hairs among the row of frontal setae; vibrissa inserted slightly above level of lower margin of face; facial ridge with 2–3 setae and several fine short hairs at most on its lower 1/5; 4–5 rather long subvibrissal setae. Antenna falling short of lower margin of face by about 1.4 times of pedicel length; pedicel bearing black hairs and a long seta, the latter 1.3–1.5 times as long as pedicel; 1st flagellomere 2.2–2.3 times as long pedicel; arista with micro-pubescence, 3rd aristomere thickened on basal 2/7.

Thorax reddish brown to dark brown in ground color, with dense golden yellow pruinosity; dorsum with 4 narrow longitudinal vittae, outer vittae about 2 times as wide as inner vittae and about 0.4 times as wide as pruinose portion between inner and outer vittae; pleura with thin pale yellowish white or grayish white pruinosity. Thoracic hairs yellow mixed with several black hairs, fine short and suberect; anatergite bare; 2 presutural and 3 postsutural acrostichal setae; 3 presutural and 3 postsutural dorsocentral setae; scutellum hairs black, several yellow hairs along margin, with 5–6 pairs of marginal setae and 2 pairs of rather fine long discal setae, the latter about as long as scutellum, 2–3 pairs of lateral setae present, basal, lateral and subapical setae subequal in length each other and 1.6–1.8 times as long as scutellum, apical seta shorter than basal and subapical setae and about 1.3 times as long as scutellum, sometimes 1 rather fine long hair inserted before basal seta.

Wing hyaline, weakly tinged with pale yellow on basal and anterior margins; basicosta reddish yellow; lower calypter yellowish white on middle and pale yellow on margin. Costa between subcosta and vein R1 about 0.5 times as long as that between R1 and R2+3; bend of vein M nearly right angled, vein M from dm-cu crossvein to its bend 1.9–2.0 times as long as distance between the bend and wing margin extending along vein M.

Legs broadly reddish yellow, base of fore coxa, entire mid and hind coxae brown, base of femora, tarsi and claws black, pulvilli pale yellowish brown. Leg hairs black, except yellow hairs on posteroventral portion of femora; fore tibia with 4 fine anterodorsal and 2 strong and long posterior setae; mid tibia with 2 anterodorsal, 3 posterodorsal and 1 ventral setae; hind tibia with 2–3 strong submedian anterodorsal setae, if 3 setae present then upper seta fine, 2–4 posterodorsal setae, if 4 setae present then upper and the 3rd setae fine, and 2–4 strong anteroventral setae, if 4 setae present then upper 2 setae fine, and with 2 preapical dorsal setae.

Abdomen broad ovate, broadly reddish yellow in ground color, brown to black on middle of tergites, entirely covered with dense yellow pruinosity, irregular spots appearing with direction of light on dorsum of syntergite 1+2 to 5th tergite. Hairs on dorsum black except yellowish on lateral and ventral tergites, fine and long; syntergite 1+2 excaved half way to posterior margin, with 2 strong median marginal setae; 3rd tergite with 2 strong median discal and a row of 12 marginal setae; 4th tergite with 2 strong median discal and a row of 12–14 strong marginal setae; 5th tergite with a row of median discal and marginal setae.

Male terminalia. Fifth sternite ( Fig. 27 ) broadly V-shaped in ventral view, broadly excavated posteromedially, without membranous area anterior to the excavation, with fine long hairs on posterior lobe; cerci ( Fig. 25 ) in dorsal view narrowly separated as V-form on apical 1/2, lateral margin nearly straight, apex pointed, with dense long and strong hairs, in lateral view dorsal margin nearly straight and ventral margin excavated near middle, basal 1/2 strongly inwardly concave, dorsal area with dense fine long hairs; surstylus ( Fig. 26 ) long, dorsal area of basal 1/4 portion with dense and short hairs, obtuse pointed apically; bacilliform sclerite very short; pregonite curved posteriorly near middle; postgonite overlapping pregonite on basal 1/2; distiphallus elongate, distal area expanded laterally; ejaculatory apodeme long, nearly fan-shaped ( Fig. 28 ).

Female. Differing from male as follows: Palpus reddish yellow, darkened on basal 1/6; vertex wider, about 0.3 of head width; frontal vitta 0.8 of fronto-orbital plate at middle; 2 strong reclinate orbital seta, about 0.95 times as long as inner vertical seta, 1 proclinate orbital seta, about 0.9 times as long as inner vertical seta; 8 rather strong frontal setae; ocellar seta hair-like, several yellowish long hairs on ocellar triangle; claws and pulvilli shorter than 5th tarsomere. Female terminalia ( Fig. 42 ). Sixth tergite long and broad; 6th sternite long and broad flat posteriorly; 7th tergite long and broad, 7th sternite long, divided into two elongate lobes on posterior portion; 8th tergite short, rounded apically; 8th sternite long and strongly sclerotized, strongly curved ventrally in middle portion, posterior portion forming a piercer.

Holotype male, Yunling, Deqin, 2600–2900 m, NW Yunnan, China, 27–31.v.2012, Q. Wang (NKU).

Paratype. CHINA: 1 female, same data as holotype.

Etymology. Specific name is taken from the broadly reddish yellow abdominal color of this species.

Remarks. Parerigone flava can be easily distinguished from the other species of the genus in having 5–6 pairs of scutellar marginal setae, legs broadly reddish yellow, and abdomen broadly reddish yellow.

Distribution. China (Yunnan).

Figures

FIGURES 5 – 8. Parerigone flava sp. nov., male. 5. Body in dorsal view. 6. Body in lateral view. 7. Head in lateral view. 8. Head in anterior view.

FIGURES 25 – 28. Male terminalia of Parerigone flava sp. nov. 25 – 26. Epandrium, cerci and surstyli. 25. Caudal view. 26. Lateral view. 27. Sternite 5 in ventral view. 28. Aedeagal apodeme, ejaculatory apodeme, hypandrium, pregonite, postgonite, basiphallus, distiphallus in lateral view. Scale bars = 0. 25 mm.

FIGURES 41 – 44. Female terminalia in lateral view. 41. Parerigone atrisetosa sp. nov. 42. Parerigone flava sp. nov. 43. Parerigone flavisquama sp. nov. 44. Parerigone laxifrons sp. nov. Scale bars = 0. 25 mm.