Dinera longirostris Villeneuve, 1936

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 : 31-33

Dinera longirostris Villeneuve, 1936

Figs. 30–32

Dinera longirostris Villeneuve, 1936: 6 . — Herting 1968: 56 (notes). — Herting 1984: 141 (Catalog). — Richter & Farinets 1984: 161 (first instar larva). — Herting & Dely­Draskovits 1993: 362 (Catalog).

Diagnosis

Small slender grayish fly with long prementum that is longer than head height, facial carina weak, 2+3 dc, wing with well developed costal spine, abdominal syntergite 1+2 excavated only to middle.

Body length 6.3 mm.

Description

Male. Head black in ground color, face, lower parafacial and gena pale reddish yellow, with dense whitish pruinosity, frontal vitta and lunule brown; antenna dark brown except for reddish brown base of flagellomere 1; palpus reddish yellow; premenum dark brown. Frons narrowest in front of ocellar triangle and about 1/13 head width; frontal vitta about 1/2 as wide as fronto­orbital plate at middle; parafacial about 3 times as wide as flagellomere 1 in lateral view; facial carina low and short, lower margin of face protruding forward; gena about 1/5 eye height. Inner vertical setae parallel to each other, about 0.4 eye height; outer vertical seta short but distinct, about 1.5 times as long as upper occipital setae; ocellar seta strong slightly longer than inner vertical seta; 7–8 inclinate frontal setae, lower ones stronger and about as long as inner vertical seta; fronto­orbital plate and parafacial bare; vibrissa inserted slightly above lower margin of face; upper occiput with 2 rows of black hairs behind postocular setae. Antenna falling short of lower margin of face by about 4/5 length of flagellomere 1; base of antenna nearly level with lower 1/3 of eye height; flagellomere 1 about twice as long as pedicel; arista including plumosity 2–2.5 times as wide as flagellomere 1. Prementum long and slender, about twice as long as head height. Palpus about 1.5 times as long as antenna.

Thorax black in ground color, with dense grayish pruinosity; thoracic dorsum with 4 rather weak black longitudinal vittae on presutural region of scutum, inner vitta 1/5–1/8 as wide as pruinose portion between inner and outer vittae, and 3 black vittae on postsutural scutum; scutellum black, gray pruinose. Postpronotal lobe with 4 setae; 2–3+3 ac; 2+3 dc; 0+3 ia, anterior one smaller; 3 sa; 2 pair of fine discal setae on scutellum, basal scutellar seta about 4/5 as long as subapical seta, the latter about 2.5 times as long as scutellum, apical scutellar seta about 1.5 times as long as scutellum. Wing pale brownish hyaline; tegula pale brown; basicosta reddish yellow; calypter white. Costal spine as long as crossvein r­m, relative length of costal sections second, third and fourth approximately as 4:9:5, vein M from dm­cu crossvein to its bend about twice as long as distance between the bend and wing margin; vein M merged with vein R 4+5 at apex. Legs black, pulvilli yellowish. Fore tibia with 1–2 p, upper one fine or absent; mid tibia with 1 fine ad, 2 pd and 1 v; hind tibia with 4–6 ad, 2–3 pd and 1 v, without apical pv.

Abdomen black in ground color, evenly covered with dense grayish pruinosity. Syntergite 1+2 excavated halfway to posterior margin, with 1 lateral marginal and 2–4 lateral discal setae, without median marginal seta; tergite 3 with 2 median marginal and 1–2 lateral marginal setae; tergites 4 and 5 each with 1–2 fine lateral discal setae and a row of marginal setae, median discal setae indistinct on tergite 5. Male terminalia small, in dorsal view, cerci slender, distinctly narrowed on apical 2/3 and pointed at apex, surstylus foot­like, blunt at apex and concave at middle; in lateral view cerci bent ventrally at apex, surstylus bluntly rounded, aedeagal apodeme long and slender, basiphallus slightly longer than postgonite, distiphallus long and slender, membranous apical part about 1.4 times as long as sclerotized basal part, with minute spinules at membranous basal part ventrally.

Material examined

CHINA. Inner Mongolia: 1 male, Tumuertai , 9.vi.1971 ( IZCAS) ; Hebei: 1 male, Nantuo, Fuping , 30.iv.1981 ( SNUC) .

Distribution China (Hebei, Inner Mongolia), Mongolia, Russia (West Siberia), Kirghizia.

Remarks

This species is characterized by having the longest prementum within the genus. It is rather similar to D. grisescens in general appearance except for its longer prementum and dark legs.