Arge radialis Gussakovskij, 1935

25. Arge radialis Gussakovskij, 1935

( Fig. 35 View FIGURE 35 )

Arge radialis Gussakovskij, 1935: 236 (key), 276–277 (description), 406 (key), 423–424 (description), ♀; Taeger et al. 2010: 137.

Current status. Arge radialis Gussakovskij, 1935 .

Type locality. China, Sichuan, Lunanfu, Khodzigou.

Holotype: ♀, <golden circle> // Сы-ч[уань]., Лунаньфу ХодЗигоу, 6000 ф. [ China, Sichuan, Lunanfu, Khodzigou, 6000 ft], 05.–06.[18]93, БереЗовск[ий] [leg. M. M. Berezovskiy] // Arge nov. spec. ♀, Konow det. // Arge radialis sp. nov., ♀, Gussakovskij det. // Zoological Institute St. Petersburg INS_HYM_0001931 [ ZISP].

Description. Female ( Fig. 35 View FIGURE 35 ). Body length 8.0 mm; fore wing length 7.8 mm.

Colour. Body black with bronze-green metallic lustre. Flagellum and mouthparts brown. Fore tibiae brown, middle and hind tibiae yellowish-white with black apex. Wings transparent; veins C and base of vein A light brown, other veins and pterostigma dark brown. Large dark spot under pterostigma and in cell Rs. Pubescence yellowish-white.

Head. Head behind eyes slightly expanded. Distance between eyes 1.3 × vertical diameter of eye; eye with vertical diameter 1.7 × its horizontal diameter. Postocellar area not convex, with weak anterior and lateral furrows. POL as OCL as OOL. Medial fovea narrow, not deep, with small pit in upper part, narrowly open to frontal area. Lateral carinae almost parallel, blunt, very thick at upper part, joined together at lower part, but not forming median carina. Malar space about equal to frontal ocellus. Supraclipeal area smooth, shiny, sparsely punctuated. Clypeus with deep, half-width semi-circular notch in middle of ventral margin. Labrum with flat ventral margin.

Antennae. Antennal length 1.3 × maximum head width; flagellum curved at base, widened towards apex, apex narrowly rounded; its setae short, dense, closely adhering.

Thorax. Mesopleuron in lower part with glabrous band; scutellum convex, narrowly rounded at apex.

Legs. Middle and hind tibia with preapical spurs; tibial spurs simple. Basal tarsomeres of hind tarsus longer than next three combined.

Wings. In fore wing, cell 3Rs with anterior margin slightly longer than posterior margin, expanded to external margin. Vein 3r-m roundly curved. Veins B and M of fore wing join up at same point on vein R. Membrane of cell 1Rs evenly covered with long setae. Wing margin between veins M and Cu non ciliate, with narrow, glabrous band along margin.

Abdomen. Abdomen oval (in dorsal view); tergites in basal half shining, wrinkled at base; in apical part very densely punctured and pubescent. Saw sheath 1.6 × as long as wide, simple, parallel-sided, broadly rounded at apex (ventral view), on inner surface with small, blunt spines; in lateral view narrow, triangular, rounded at apex, almost straight on ventral margin.

Lance in lateral view convex, narrowed towards apex, distinctly pointed at apex, medially covered with annuli. Maximum width of lance equal to lancet width. Carina of apical part of dorsal margin long, well defined, with finely, irregular and indistinct denticles, remaining part of dorsal margin with longitudinal deep fossa. Lancet with straight dorsal and convex ventral margin. Annuli slightly curved at base and dorsally inclined towards apex, in apical part indistinct. Annular spines (ctenidia) short, simple, 0.3 × as long as width of annulus. Ventral margin with 8 distinctly distinguishable only in basal part serrulae. Serrulae almost flat, slightly triangular, with only indistinct denticles. In apical third serrulae triangular, oblique, rounded at apex, rest of serrulae papillate, bluntly rounded. Apical half of ventral margin with small denticles. Between serrulae two or three long and slightly curved pore canals of marginal sensilla.

Remark. The original description is given on a single specimen ( holotype). The males are unknown.