Arge coriacea Jakowlew, 1891

11. Arge coriacea Jakowlew, 1891

( Fig. 16 View FIGURE 16 )

Arge coriacea Jakowlew, 1891: 21 , ♂.

Current status. Arge simillima (F. Smith, 1874) (according to Taeger et al. 2010: 139).

Type locality. China, Gansu, “Li-dzha-ku”.

Holotype: ♂, <golden circle> // Ли-чжа-ку [ China, Gansu, “Li-dzha-ku”], 19.06.[18]85, Потанинъ [ G.N. Potanin leg.] // к.[оллекциЯ] А. Яковлева [ Collection of A.I. Jakowlew] // Hylotoma coriacea Yak [owlew]. // Arge forficula Yak [owlew]., ♂, det. Gussakovski [j] // Arge simillima (Smith, 1874) , ♂, Det. M.C. Wei, 2014 // DEIGISHym 89419 // HOLOTYPUS Arge coriacea Jakowlew, 1891 , ♂, teste A. Taeger 2018 // Zoological Institute St. Petersburg INS_HYM_0001915 [ ZISP] .

Description. Male ( Fig. 16 View FIGURE 16 ). Body length 7.6 mm; fore wing length 7.0 mm.

Colour. Body entirely dark brown (probably result of discolouration, black in original description) with indistinct metallic blue lustre. Wings hyaline, with brown veins and pterostigma. Body with sparse brown setae.

Head. Head behind eyes slightly constricted. Distance between eyes 1.3 × 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 1.0: 1.0: 1.5. Medial fovea wide, flat, in upper part with deep fossa and open towards frontal area. Lateral carinae parallel below, blunt and broadened in upper part. Supraclypeal area not convex. Malar space nearly equal diameter of frontal ocellus. Clypeus with shallow semi-circular notch along ventral margin. Labrum with concave ventral margin.

Antennae. Antennal length 2.3 × maximum head width; flagellum weakly curved at base, apex narrowly rounded.

Thorax. Mesopleurae with glabrous area in lower part; scutellum flat and 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 nearly equal to posterior margin, expanded externally. Vein 3r-m roundly curved. Veins B and M of fore wing join up at same point on vein R. Membrane of cell 1Rs with dense, long setae. Wing margin between veins M and Cu not ciliate.

Abdomen. Abdomen slender, parallel. Subgenital plate in ventral view with rounded posterior margin.

Genitalia as in Fig. 16j View FIGURE 16 , gonostipes broad, convex on inner margin, tapering towards apex. Harpe parallel at base, narrowed at apex, elongated, length 1.4 × width at base, densely covered with tiny setae. Valve of penis with simple valviceps, flat, bluntly rounded at apex. Valviceps in dorsal view tapered towards apex, with small lateral lobe at base; in lateral view slightly tapered towards apex, apex rounded, at base of ventral margin bluntly rounded perpendicular to valviceps lobe with unpigmented inner margin. Dorsal process (ergot) clearly visible, slightly curved.

Remark. The original description is given on a single specimen ( holotype). Holotype strongly discoloured, wing membrane partially destructed.