Dinera maculosa, Zhang & Shima, 2006

Zhang, Chun-Tian & Shima, Hiroshi, 2006, A systematic study of the genus Dinera Robineau-Desvoidy from the Palaearctic and Oriental regions (Diptera: Tachinidae), Zootaxa 1243 (1243), pp. 1-60 : 33-36

Dinera maculosa sp. nov.

Figs. 33–36

Diagnosis

Small slender grayish yellow fly; 2–3+3 dc; costal spine absent; abdomen with dark triangular spot on each tergite, abdominal syntergite 1+2 excavated only on basal 1/2, without median marginal seta, tergites 3 and 4 each without median discal seta.

Body length 6.7–9.0 mm.

Description

Male. Head black in ground color, gena reddish brown, with dense pale yellowish gray pruinosity; frontal vitta black; lunule pale brownish; antenna and palpus dark brown. Frons narrowed above, narrowest in front of ocellar triangle, at the narrowest point about 1/15 head width; frontal vitta strongly narrowed above, linear at narrowest point and subequal in width to palpus; parafacial weakly widened below, about 3 times as wide as flagellomere 1 at middle height; gena wide, about 1/2 eye height; facial carina high, rather wide and flattened on anterior surface, arched in lateral view; lower margin of face rather weakly protruding forward. Inner and outer vertical setae fine hair­like, about 2/5 eye height; ocellar seta rather strong, about 1.5 times as long as inner vertical seta; 9–11 inclinate frontal setae, longest seta about as long as ocellar seta; vibrissa inserted slightly above lower margin of face by about 2/3 length of pedicel; occiput with 2–3 rows of black hairs behind postocular setae. Antenna falling short of lower margin of face by about 3/4 length of flagellomere 1; base of antenna about level with lower 1/4 of eye height; flagellomere 1 2.5–3 times as long as pedicel; pedicel with a long seta that is as long as pedicel and flagellomere 1 combined; arista including plumosity 2–2.5 times as wide as flagellomere 1. Prementum slender, about 7 times as long as wide, 0.7–0.8 of eye height; palpus about 4/5 as long as prementum.

Thorax black in ground color, with yellowish or pale yellowish gray pruinosity; dorsum with 3 black longitudinal vittae, median vitta stopped at anterior 1/3 of presutural area, about twice as wide as lateral vitta. Postpronotal lobe with 3–4 setae; 1+2 ac; 2–3+3 dc; 2 ia; 3 sa; 2+1 katepisternal setae, lowest seta sometimes very fine or absent; scutellum with basal seta about 2.5 times as long as scutellum and subequal to subapical seta, apical seta about twice as long as scutellum. Wings hyaline, evenly and weakly tinged with pale brown; tegula dark brown; basicosta reddish yellow; lower calypter pale brownish, paler marginally. Costal spine absent; relative length of second, third and fourth costal sections approximately as 1:2.1:1.1; vein M from dm­cu crossvein to its bend about twice as long as distance between the bend and wing margin. Legs black, pulvilli pale brownish. Fore tibia with 2 p; mid tibia with 1 ad and 2–3 pd, without v; hind tibia with 2–3 ad, 2–3 pd and 2 v, apical pv present.

Abdomen long ovate, black in ground color, with dense pale yellowish gray pruinosity, a dark brown subtriangular median spot present on each tergite, the dark spot sometimes weak and diffusing marginally on tergite 5. Syntergite 1+2 excavated 1/2–2/3 of distance to posterior margin, with 1 lateral marginal seta, without median marginal seta; abdominal tergites with dense erect long hairs, without median discal seta; tergite 3 with 2 median marginal and 2–3 lateral marginal setae; tergites 4 and 5 each with a row of marginal setae. Sternite 5 nearly square, posterior lobe wide and blunt; V­shaped median cleft deep and narrow. Male terminalia. Cerci wide at base and strongly narrowed on apical 3/ 5 in lateral view, slightly and evenly curved ventrally; surstylus wide and rounded on dorsal margin; postgonite shorter than basiphallus; distiphallus long, apical membranous part about 3 times as long as basal sclerotized part.

Female. Differing from male as follows: Body with dense yellowish gray pruinosity; palpus brown to dark brown; vertex 0.33–0.38 head width; parafacial about 3 times as wide as flagellomere 1; gena 2/3–3/4 eye height; inner vertical seta strong, about 2/3 eye height and slightly longer than ocellar seta; outer vertical seta developed, about 3/4 as long as inner vertical seta; 5–6 inclinate frontal setae; 2 proclinate orbital setae as long as inner vertical seta, 1 outwardly directed prevertical seta slightly shorter than outer vertical seta; ususally 1+1 katepisternal setae; calypters brownish to yellowish white; mid tibia with 2 ad, 3 pd and 1 v setae; claw and pulvillus distinctly shorter than 5th tarsomere; abdomen with dense yellowish gray pruinosity and shifting appearance with direction of light, a dark brown median vitta visible on syntergite 1+2 to tergite 4, the vitta diffusing marginally.

Type material

Holotype ♂, CHINA, Kangding, Yulin , 3000 m, Sichuan, 20.viii.1993, H. Shima ( BLKU) . Paratypes CHINA. Sichuan: 2 males, 1 female, same as holotype ; 1 male, 7 females, Xingdu Qiao, 3700 m, Kangding , 22.viii.1993, H. Shima ; 2 males, Mt. Zheduo, 3000 m, Kangding , 21.viii.1993, A. Nakanishi . Yunnan: 1 female, 10 km N. Deqen, 3300 m, Deqen , 21.vii.1996, H. Shima ; 1 male, 50 km SE Deqen , 3400 m, 22.viii.1996, W.­x. Zhang ( BLKU) ). 1 male, 1 female, Zhongdian, Gezi , 3150 m, 5.viii.1981, X.­z. Zhang ( IZCAS) .

Etymology

Latin adjective maculosus (= spotted) is taken from a diagnostic character of this species, abdominal tergites each with a dark triangular spot.

Remarks

This species is similar to D. alticola , but differs from it in having a narrow lateral thoracic vitta, abdominal tergites each with a dark brown subtriangular spot, shorter postgonite, and distiphallus with a longer membranous apical part.