Arge chrysoptera Gussakovskij, 1935

7. Arge chrysoptera Gussakovskij, 1935

( Figs 9 View FIGURE 9 , 10 View FIGURE 10 )

Arge chrysoptera Gussakovskij, 1935: 234 (key), 266–267 (description), 404 (key), 420–421 (description), ♂, ♀.

Spinarge chrysoptera ( Gussakovskij, 1935) : Hara & Shinohara, 2006: 90–91, combination with Spinarge .

Current status. Spinarge chrysoptera ( Gussakovskij, 1935) (according to Hara & Shinohara 2006: 90–91 and Taeger et al. 2010: 149).

Type locality. China, Sichuan, Kangting.

Lectotype (designated here): ♀, <golden circle> // Сычуань, ТацЗинлу [ China, Sichuan, Kangting , 30°02'N 101°57'E], 2.06.[18]93, Потанин [ G.N. Potanin leg.] // Arge chrysoptera sp. nov., ♀, Gussakovskij det. // DEIGISHym 89427 // GoogleMaps SYNTYPUS, Arge chrysoptera Guss., 1935 , ♀, teste A. Taeger 2018 // Zoological Institute St. Petersburg INS_HYM_0001907 [ ZISP] .

Paralectotype: ♂, <golden circle> // Сычуань, ТацЗинлу [ China, Sichuan, Kangting ], 24.05.[18]93, Потанинъ [ G.N. Potanin] // Arge chrysoptera sp. nov ., ♂, Gussakovskij det. // DEI-GISHym 89426 // SYNTYPUS, Arge chrysoptera Guss., 1935 , ♂, teste A. Taeger 2018 // Zoological Institute St. Petersburg INS_HYM_0001908 [ ZISP] .

Description. Female ( Fig. 9 View FIGURE 9 ). Body length 9.2 mm; fore wing length 9.7 mm.

Colour. Body entirely black with weak metallic blue lustre. Wings golden-yellow, including veins and pterostigma, slightly lighter towards apex. Body uniformly pubescent with black setae, only 5 basal tergites almost glabrous.

Head. Head behind eyes distinctly expanded, distance between eyes 1.6 × vertical diameter of eye. Vertical diameter of eye 1.6 × of horizontal diameter. POL: OCL: OOL as 1.0: 1.3: 2.0. Temporal area not elevated and not limited by sutures. Middle fovea broad, sharply tapering downwards, not closed at top, its upper half deeply roundly impressed, lower half flat, not deep. Lateral carinae of frontal furrow blunt, sharply converging downwards, but not joined, narrowly and parallel on supraclypeal area. Supraclypeal area slightly angularly convex in lateral view. Malar space 1.5 × diameter of frontal ocellus. Clypeus narrow, with deep semi-circular notch on ventral margin. Labrum on ventral margin flat, slightly rounded.

Antennae. Length of antenna is 1.4 × maximum width of head. Flagellum slightly curved at base and distinctly broadened to apex. At apex narrowly rounded. On frontal surface of flagellum not only sharp longitudinal median carina, but also on sides from it two blunt, but distinct lateral carinae.

Thorax. Lower part of mesopleurae glabrous; scutellum flat, broadly rounded along hind margin.

Legs. Middle and hind legs with preapical spurs. Tibial spurs simple. Basal tarsomeres of hind tarsus approximately equal to three following combined.

Wings. Cell 3Rs with equal anterior and posterior margin, distinctly broadened to apex of wing. Vein of 3p-m roundly curved. Veins B and M of fore wing join up at same point on vein R. Membrane of cell 1Pc densely covered with long setae. Wing margin between veins M and Cu with glabrous margin.

Abdomen. Abdomen oval (in dorsal view), about 1.5 × as long as width, tergites with median longitudinal carina, most expressed on middle tergites, hind margin of tergite 5 with distinct small convex rounded projection. Saw sheaths in lateral view triangular, narrowed to apex, convex along ventral margin; ventrally parallel, length 1.5 × its width, triangular at apex, converging at obtuse angle, with distinct impression at basal part.

Lance in lateral view triangular, narrowed to apex, covered with annuli from middle to base; about width of lancet. Carina of apical part of dorsal margin clearly defined, with irregular and indistinct denticles, remaining part of dorsal margin with longitudinal shallow fossa. Lancet with straight dorsal and slightly convex ventral margin. Annuli nearly straight and dorsally inclined towards apex, weakly curved in basal part. Annular spines (ctenidia) short, simple, several times shorter than width of annulus. Ventral margin with 23 flat, weakly sclerotised serrulae, indistinguishable in apical third. Serrulae flat, broad, length 6–7 × height, basal weakly rounded; only margins of 14–15 basal serrulae clearly distinguishable, with margin covered by small indistinct denticles. Between serrulae two (rarely three) unequal long and straight pore canals of marginal sensilla.

Male ( Fig. 10 View FIGURE 10 ). Body length 8.3 mm; fore wing length 8.3 mm.

Colouration as in female. Distance between eyes 1.4 × vertical diameter of eye. Lateral carinae of median fovea sharp. POL: OCL: OOL as 1.1: 1.0: 1.6. Length of antenna 2.0 × maximum width of head. Flagellum weakly uniformly curved and pointed dorsally, frontally bluntly obtuse at apex and weakly widened, with series of long setae. Abdomen narrow, tergites with weak longitudinal medial carina, tergite 5 with long medial spur on hind margin, which reaches more than half of length of subsequent tergite, tergites from sixth in center distinctly impressed. Subgenital plate in ventral view with rounded posterior margin.

Genitalia as in Fig. 10j View FIGURE 10 , gonostipes narrow, sharply tapered towards apex. Harpe subtriangular, length equal to width at base, evenly covered with setae. Valve of penis simple, flat, strongly sclerotised along dorsal margin. Valviceps in dorsal view acuminate towards apex, with pronounced triangular lateral lobe in apical third, slightly broadened at base; in lateral view apex with small triangular lobe densely covered with large pores, and large, elongate, rounded lobe bent dorsally (margin weakly pigmented and devoid of pores).At base of ventral margin large, weakly sclerotised, bluntly rounded triangular lobe. Dorsal process (ergot) not pronounced. At valvura membrane at end of duct strongly developed in form of well sclerotised structure. Apex of valvura flat and strongly expanded.

Remark. For more information on the species, see Hara & Shinohara (2006). Repeated measurements of body length and wing length are consistent with original description ( Gussakovskij, 1935), otherwise not inconsistent with the description in Hara & Shinohara (2006).

The original description is based on one female and one male syntypes originating from the same locality “Sychuan’, Tatsinlu” ( China, Sichuan, Kangting) (translated from Gussakovskij 1935: 421). These two specimens were found in ZISP. The female is here designated as the lectotype .