Arge carbonaria Gussakovskij, 1935

6. Arge carbonaria Gussakovskij, 1935

( Fig. 8 View FIGURE 8 )

Arge carbonaria Gussakovskij, 1935: 235 (key), 275 (description), 405 (key), 422 (description), ♀; Taeger et al. 2010: 127. Current status. Arge carbonaria Gussakovskij, 1935 .

Type locality. Mongolia, Khentii Mountains, Sutszukte Canyon.

Holotype: ♀, <golden circle> // УЩ[елье]. СуцЗуктЭ, Ю[го]-З[ападный] КентЭй, МонголиЯ [ Mongolia, Khentii Mountains, Sutszukte Canyon ], 13.07.[1]925, КоЗлов [ P.K. Kozlov leg.] // Arge carbonaria sp. nov., ♀, Gussakovskij det. // DEI-GISHym 89425 // HOLOTYPUS, Arge carbonaria Guss., 1935 , ♀, teste A. Taeger 2018 // Zoological Institute St. Petersburg INS_HYM_0001906 [ ZISP] .

Description. Female ( Fig. 8 View FIGURE 8 ). Body length 9.7 mm; fore wing length 8.7 mm.

Colour. All body black, with slight metallic blue lustre, middle of mandibles, last segment of maxillary palps and spurs reddish. Wings slightly darkened towards base (black in original description, only lighter towards apex), cell C distinctly darkened, veins and pterostigma black-brown. Body uniformly pubescent with silvery setae, on abdomen sparser at base and denser towards apex.

Head. Head behind eyes strongly expanded, distance between eyes 1.5 × vertical diameter of eye. Vertical diameter of eye 2.1 × horizontal diameter. Temporal area weakly convex, not restricted by sutures. POL: OCL: OOL as 1.0: 1.0: 1.1. Median fovea broad, not deep, open from above. Lateral carinae of median fovea blunt, converging at acute angle towards lower part, indistinct, passing into barely visible median carina. Supraclypeal area convex, malar space 1.5 × larger than frontal ocellus, clypeus flat, with semi-circular notch one third of width in middle of ventral margin.

Antennae. Antennae1.2 × as long as maximum width of head. Flagellum slightly curved at base, apex rounded. Densely covered with short, adjoining setae.

Thorax. Mesopleurae with small glabrous area below, scutellum flat, broadly rounded dorsally.

Legs. Middle and hind legs with preapical spurs. Tibial spurs simple. Basal tarsomere of hind tarsus slightly shorter (7:8) than three following ones combined.

Wings. Cell 3Rs with anterior margin slightly larger than posterior margin; slightly wider on external margin than at base; vein 3r-m roundly curved. Veins B and M of fore wing join up at same point on vein R. Cell 1Rs evenly covered with short setae. Wing margin between veins M and Cu not ciliated and without glabrous margin.

Abdomen. Abdomen oval (in dorsal view), about 1.5 × as long as width. Saw sheath ventrally parallel-sided, broad, about 1.5 × as long as width, narrowly narrowed at apex; laterally narrow, narrowly rounded at apex; inner surface covered with short blunt thick spines.

Lance in lateral view slightly convex, gradually tapering towards apex, annuli distinct in apical half, width equal to lancet width. Carina of apical part of dorsal margin high, with finely, irregular and indistinct denticles, remaining part of dorsal margin with longitudinal shallow fossa. Lancet with straight dorsal and convex medially ventral margin. Annuli at base straight, dorsally inclined towards apex, in apical half arcuately curved. Annular spines (ctenidia) short, simple, 0.3 × as long as width of annulus. Ventral margin with 18, indistinct at apex, weakly sclerotised serrulae. Serrulae with indistinct denticles. Serrulae in apical part flat, in middle rounded, at base distinctly triangular. Between serrulae two (rarely one) unequal straight, short pore canals of marginal sensilla.

Remark. The original description is given for a single specimen which represents the holotype. The males are unknown.