Arge labidura Gussakovskij, 1935

17. Arge labidura Gussakovskij, 1935

( Figs 22 View FIGURE 22 , 23 View FIGURE 23 )

Arge labidura Gussakovskij, 1935: 227 (key), 247–248 (description), 397 (key), 412–413 (description), ♂, ♀; Taeger et al. 2010: 132.

Current status. Arge labidura Gussakovskij, 1935 .

Type locality. China, Sichuan, Kangting.

Lectotype (designated here): ♀, <golden circle> // Сычуань, ТацЗинлу [ China, Sichuan, Kangting , 30°02'N 101°57'E], 1.07.[18]93, Потанин [ G.N. Potanin leg.] // Arge labidura sp. nov., ♀, Gussakovskij det. // DEI-GISHym 89436 // GoogleMaps SYNTYPUS Arge labidura Guss., 1935 , ♀, teste A. Taeger 2018 // Zoological Institute St. Petersburg INS_HYM_0001919 [ ZISP] .

Paralectotype: ♂, same labels as lectotype but // DEI-GISHym 89435 // Zoological Institute St. Petersburg INS_HYM_0001920 [ ZISP] .

Description. Female ( Fig. 22 View FIGURE 22 ). Body length 12.2 mm; fore wing length 11.8 mm.

Colour. Head, antennae, legs, lower part of mesopleurae, concave parts of metanotum, apex of saw sheath black, with slight blue lustre. Middle part of mandibles brown. Thorax reddish, abdomen yellow-orange. Wings darkened, especially cell C, slightly lighter towards apex. Head pubescence dark brown, on thorax and abdomen yellowish.

Head. Head behind eyes slightly expanded. Distance between eyes 1.5 × vertical diameter of eye; eye with vertical diameter 1.7 × its horizontal diameter. Postocellar area weakly convex, with weak anterior and lateral furrows. POL: OCL: OOL as 1.1: 1.0: 1.7. Medial fovea broad, flat in lower part, with distinct rounded pit in upper part, open towards frontal area. Lateral carinae blunt, short, below antennae sockets converging, indistinct. Supraclypeal area slightly elevated, glossy, evenly covered with setae. Malar space more than diameter of frontal ocellus. Clypeus with weak semi-circular emargination on ventral margin. Labrum densely punctured, concave on ventral margin.

Antennae.Antennal length 1.9 × maximum head width; flagellum slightly curved, smoothly distinctly broadened to apex, apex broadly rounded. Antennal setae dense, short, densely adherent.

Thorax. Mesopleurae in lower part with glabrous band; scutellum flat, 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 significantly longer than posterior margin, distinctly expanded to external margin. Vein 3r-m angularly curved. Veins B and M of fore wing join up at same point on vein R. Membrane of cell 1Rs densely covered with long setae. Wing margin between veins M and Cu not ciliate, without glabrous stripe along margin.

Abdomen. Abdomen wide, oval; tergites smooth, shiny, basally glabrous. Saw sheath 1.6 × as long as wide, complex, claw-shaped, lateral lobes on inner side of apex with blunt short spines; medial lobe narrow, smooth and shiny, acute at apex (ventral view), smoothly tapering to apex; in lateral view narrow, protruding beyond apex of abdomen, bluntly rounded at apex.

Lance in lateral view narrow, slightly convex, almost parallel, slightly tapering towards apex, uniformly covered with annuli weakly distinguishable at apex. Maximum width of lance slightly narrower than lancet width. Carina of apical part of dorsal margin with finely, irregular and indistinct denticles, remaining part of dorsal margin with longitudinal shallow fossa. Lancet triangular, with almost straight ventral and dorsal margin. Annuli nearly straight and dorsally slightly inclined towards apex, distinguishable almost up to apex. Annular spines (ctenidia) short, simple, several times shorter than width of annulus. Ventral margin with 23 serrulae, at apex indistinguishable. Serrulae triangular, covered with denticles. In apical part with strongly unequal sides, at base rounded. Between serrulae one (less often two or three unequal) long and straight pore canals of marginal sensilla.

Male ( Fig. 23 View FIGURE 23 ). Body length 9.0 mm; fore wing length 8.9 mm.

In colouration as female, but abdomen yellow-orange, only tergite 1 reddish, tegulae black with blue metallic lustre. Head behind eyes parallel. Distance between eyes 1.4 × vertical diameter of eye; eye with vertical diameter 1.5 × its horizontal diameter. POL: OCL: OOL as 1.2: 1.0: 1.9. Antennal length 2.3 × maximum head width Flagellum long, narrow, weakly evenly curved, narrowly rounded at apex, setae on anterior surface long detached. Abdomen narrow, parallel. Subgenital plate in ventral view triangularly narrowed to apex, at apex with slightly concave posterior margin.

Genitalia as in Fig. 23j View FIGURE 23 , gonostipes broad, convex on inner margin, tapering towards apex. Harpe triangular, tapered at apex, elongated, length 1.5 × width at base, densely covered with long setae. Valve of penis simple, flat, rounded at apex. Valviceps in dorsal view straight, apex laterally semi-circular, small lateral lobe at base; in lateral view straight, broadly semi-circularly widened at apex, with large pores, ventrally with broad semi-circular notch in middle, and at base with small lobe slightly curved to apex. Dorsal process (ergot) clearly defined, curved towards apex.

Remark. The original description is based on one female and one male syntypes originating from “Sychuan’, Tatczinlu” ( Sichuan, Kangting) (translated from Gussakovskij 1935: 413). They were found in ZISP. The female is here designated as the lectotype.