Arge przhevalskii Gussakovskij, 1935

24. Arge przhevalskii Gussakovskij, 1935

( Figs 33 View FIGURE 33 , 34 View FIGURE 34 )

Arge przhevalskii Gussakovskij, 1935: 228 (key), 244 (description), 398 (key), 409–410 (description), ♂, ♀; Taeger et al. 2010: 137.

Current status. Arge przhevalskii Gussakovskij, 1935 .

Type locality. China, Sichuan, Anzhou District.

Lectotype (designated here): ♂, <golden circle> // Сычуань, Яджоу [ China, Sichuan, Anzhou District ], 28.03.–5.04.[18]93, Потанинъ. [leg. G.N. Potanin] // Arge przhevalskii sp. nov., ♂, Gussakovskij det. // DEIGISHym 89421 // SYNTYPUS, Arge przhevalskii Guss., 1935 , ♀, teste A. Taeger 2018 // Zoological Institute St. Petersburg INS_HYM_0001929 [ ZISP] .

Paralectotypes: ♂, same label as lectotype, but DEI-GISHym 89422 // Zoological Institute St. Petersburg INS_HYM_0001930 [ ZISP] ; ♀, same label as lectotype [lost]; ♂, <golden circle> // Хр[ебет]. Муни-Ула [ China, Inner Mongolia, Muni-Ula Ridge ], 2/2.06.[18]71, Пржевальский. [leg. N.M. Przhevalskiy] // Arge przhevalskii sp. nov ., ♂, Gussakovskij det. [lost].

Description. Male ( Fig. 33 View FIGURE 33 ). Body length 6.7 mm; fore wing length 6.3 mm.

Colour. Head, thorax, two basal antennomeres black with strong light blue metallic lustre. Flagellum, legs, most part of two basal tergites, except narrow border along hind margin black with slight blue lustre. Large part of abdomen and border along hind margin of two basal tergites yellow. Mouthparts brown. Wings slightly uniformly darkened, in apical half slightly lighter. Veins and pterostigma black. Pubescence yellowish-white, on pronotum and mesonotum brown.

Head. Head behind eyes slightly constricted. Distance between eyes 1.2 × vertical diameter of eye; eye with vertical diameter 1.6 × its horizontal diameter. Postocellar area not convex, with weak lateral furrows. POL: OCL: OOL as 1.3: 1.0: 1.4. Medial fovea narrow, flat in lower part, with distinct rounded pit in upper part, closed. Lateral carinae sharp, parallel, joined in long, sharp carina. Supraclypeal area not elevated with rare punctures. Malar space about equal to diameter of frontal ocellus. Clypeus with small semi-circular medial notch on ventral margin. Labrum slightly concave along ventral margin.

Antennae. Antennal length 1.9 × maximum head width; flagellum narrow, slightly curved at base, narrowly rounded at apex. Antennal setae frontally short and erect, on posterior surface short and adjoining.

Thorax. Mesopleurae uniformly, densely pubescent, in lower part with glabrous band; scutellum convex, broadly rounded at apex.

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

Wings. In fore wing, cell 3Rs with anterior margin equal to posterior margin, external margin 2.0 × as long as inner margin. Vein 3r-m slightly 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 ciliate, its setae shorter than width of vein M.

Abdomen. Abdomen narrow, parallel, uniformly pubescent, basal tergites almost glabrous. Subgenital plate in ventral view with broadly rounded posterior margin.

Genitalia as in Fig. 33j View FIGURE 33 , gonostipes broad, convex on inner margin, tapering towards apex. Harpe triangular, elongated, length 1.6 × width at base, densely covered with long setae. Valve of penis simple, flat, strongly elongated at apex. Valviceps in dorsal view straight, strongly narrowed towards apex, medially with pronounced lateral lobe; in lateral view along dorsal margin with rounded notch, at apex strongly elongated into long narrow apical lobe rounded at apex and slightly curved dorsally, ventral margin convex, with membranous unpigmented area at base. Dorsal process (ergot) short and almost straight.

Female ( Fig. 34 View FIGURE 34 ). Body length 7–8 mm (according to original description).

In colouration as male, but abdomen, saw sheath yellow. Apical third of wing is distinctly more transparent. Saw sheath 1.6 × as long as wide, simple, parallel-sided, broadly rounded at apex (ventral view); in lateral view triangular, narrowly rounded at apex, slightly convex on ventral margin.

Lance in lateral view convex, medially covered with annuli. Maximum width of lance equal to lancet width. Carina of apical part of dorsal margin well developed with finely, irregular and indistinct denticles, remaining part of dorsal margin with longitudinal fossa. Lancet with straight dorsal and convex ventral margin. Annuli nearly straight and dorsally inclined towards apex, in apical part indistinct. Annular spines (ctenidia) short, simple, several times shorter than width of annulus. Ventral margin with 18 well-distinct serrulae. Serrulae triangular, oblique, with broadly rounded apex, with small indistinct denticles. Between serrulae one (less often two unequal) short and straight pore canals of marginal sensilla.

Remark. The original description is based on one female and three male syntypes originating from several collection sites in the “Muni-Ula” ( China, Inner Mongolia, Muni-Ula Ridge) and “Sychuan’, Yachzhou” ( China, Sichuan, Anzhou District) (translated from Gussakovskij 1935: 410). Two males were found in ZISP. The male from Anzhou District is here designated as the lectotype. Two paralectotypes are reliably lost (Dr A. Shinohara, personal comm.). The description of the female based only on several saved photos. The lost the male paralectotypes belongs to Arge kozlovi , with which they are identical both in the structure of genitalia and locality.

The shape of genitalia and colouration of Arge przhevalskii are almost identical to those of A. aurora Wei, 2022 , which has been recently described from China ( Gansu, Hunan, Sichuan, etc.) ( Wan et al. 2022). It may be its junior synonym, but this suggestion requires the additional verification.