Arge pallidinervis Gussakovskij, 1935

19. Arge pallidinervis Gussakovskij, 1935

( Figs 26 View FIGURE 26 , 27 View FIGURE 27 )

Arge pallidinervis Gussakovskij, 1935: 237 (key), 281–282 (description), 407 (key), 426 (description), ♂, ♀; Taeger et al. 2010: 136.

Current status. Arge pallidinervis Gussakovskij, 1935 .

Type locality. Armenia, Arax Valley.

Lectotype (designated here): ♀, <golden circle> // Caucasus. Araxesthal. [ Armenia, Caucasus , Arax Valley] Leder. Reitter. [leg. Leder, Reitter] // Arge pallidinervis sp. nov., ♀, Gussakovskij det. // DEI-GISHym 89437 // SYNTYPUS Arge pallidinervis Guss., 1935 , ♀, teste A. Taeger 2018 // Zoological Institute St. Petersburg INS_ HYM_0001921 [ ZISP] .

Paralectotypes: ♂, <golden circle> // Caucasus. Armen[ien]. Geb [iet]. [ Armenia, Caucasus] Leder. Reitter. [leg. Leder, Reitter] // Arge ustulata L , ♂, Fr. W. Konow det. // Arge pallidinervis sp. nov., ♂, Gussakovskij det. // DEI-GISHym 89438 // SYNTYPUS Arge pallidinervis Guss., 1935 , ♂, teste A. Taeger 2018 // Zoological Institute St. Petersburg INS_HYM_0001922 [ ZISP] ; ♂, same labels as paralectotype, but DEI-GISHym 89439 // Zoological Institute St. Petersburg INS_HYM_0001923 .

Description. Female ( Fig. 26 View FIGURE 26 ). Body length 8.0 mm; fore wing length 7.9 mm.

Colour. Body black with green metallic lustre; concave parts of metanotum, basal half of abdomen with light blue metallic lustre. Tergites of abdomen on posterior margin with yellow-brown narrow band widened medially. Flagellum light brown. Mandible orange in middle, reddish-brown at apex, mouthparts light brown. Apex of femora, tibiae and tarsi yellow-white, tarsi at apex slightly darkened. Wings hyaline, veins and pterostigma pale, vein Cu brown. Pubescence yellowish-white.

Head. Head behind eyes significantly expanded. Distance between eyes 1.4 × vertical diameter of eye; eye with vertical diameter 1.9 × its horizontal diameter. Postocellar area convex, with weak lateral furrows. POL: OCL: OOL as 1.1: 1.0: 1.2. Medial fovea broad, flat in lower part, with weak rounded pit; in upper part, open towards frontal area. Lateral carinae sharp, converging downwards, joining in short indistinct median carina. Supraclypeal area weakly convex, densely punctuated and wrinkled. Malar space 1.5 × diameter of frontal ocellus. Clypeus smooth, shiny, sparsely punctate, with distinct medial semi-circular notch on ventral margin. Labrum with weakly rounded ventral margin.

Antennae. Antennal length 1.4 × maximum head width; Flagellum weakly curved at base, widened towards apex, apex narrowly rounded; its setae short, dense, partially bent.

Thorax. Mesopleuron in lower part with glabrous band; scutellum flat, broadly rounded at apex.

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

Wings. In fore wing, cell 3Rs with anterior margin slightly longer than posterior margin, expanded to external margin. Vein 3r-m roundly 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, with sparse setae shorter than width of vein M.

Abdomen. Abdomen parallel, distinctly narrowed towards apex. Tergites in basal half smooth and shining, in apical part very densely punctured and pubescent. Saw sheath 1.7 × as long as wide, simple, triangular, tapering and pointed towards apex (ventral view), on inner surface with small, blunt spines; in lateral view narrow, triangular, pointed at apex, slightly convex on ventral margin.

Lance in lateral view slightly convex, sharp at apex, medially covered with annuli. Maximum width of lance slightly greater than lancet width. Carina of apical part of dorsal margin well defined with, irregular denticles, remaining part of dorsal margin with longitudinal deeply fossa.Lancet with straight dorsal and convex ventral margin. Annuli curved, in apical part indistinct. Annular spines (ctenidia) short, simple, several times shorter than width of annulus. Ventral margin with 18 well-distinct serrulae, barely distinguishable at apex. Serrulae almost smooth, with only indistinct denticles. In apical half serrulae triangular, oblique, rounded at apex, rest of serrulae equilateral narrowly rounded. Between serrulae two (rarely three) unequal, straight pore canals of marginal sensilla.

Male ( Fig. 27 View FIGURE 27 ). Body length 8.2 mm; fore wing length 6.9 mm.

In colouration as female, but antennae completely black with blue-green metallic lustre; basal part of vein Rs dark brown. Antennal length 2.0 × maximum head width; flagellum weakly curved, thin, long, narrowly rounded at apex, on front surface with protruding long setae. Distance between eyes 1.2 × vertical diameter of eye; eye with vertical diameter 1.6 × its horizontal diameter. Lateral carinae of medial sulcus converge below at acute angle, joined and form blunt medial carina. Subgenital plate in ventral view with rounded posterior margin.

Genitalia as in Fig. 27j View FIGURE 27 , gonostipes very broad. Harpe oblong, base narrower than apex, length 1.5 × width at base, apical half covered with long rigid setae. Valve of penis simple, with developed lateral lobe, with narrowly rounded apex. Valviceps in dorsal view straight, with large rounded lateral lobe at apex; in lateral view on ventral margin with large squarish lobe half its length, gradually narrowing towards apex. Dorsal process (ergot) clearly defined, curved towards apex.

Remark. The original description is based on one female and two male syntypes originating from several collection sites in the “Araxesthal ( Armenia, Caucasus, Arax Valley) and Armyanskiy khrebet ( Armenia, Caucasus)” (translated from Gussakovskij 1935: 426). One female and two males were found in ZISP. The female from Arax Valley is here designated as the lectotype.