Arge rufocincta Gussakovskij, 1935

26. Arge rufocincta Gussakovskij, 1935

( Figs 36 View FIGURE 36 , 37 View FIGURE 37 )

Arge rufocincta Gussakovskij, 1935: 230 (key, ♀), 236 (key, ♂), 262–263, 400 (key, ♀), 406 (key, ♂), 419–420, ♂, ♀. Current status. Arge longicornis Kuznetzov-Ugamskij, 1927 (synonymized by Shinohara et al. 2012).

Type locality. Japan, Hakodate.

Lectotype (designated here): ♀, <golden circle> // Hakodate [ Japan, 41°75'N 140°71'E], Albrecht [leg.] // Arge rufocincta sp. nov., ♀, Gussakovskij det. // DEI-GISHym 89444 // SYNTYPUS Arge rufocincta Guss., 1935 , ♀, teste A. Taeger 2018 // Zoological Institute St. Petersburg INS_HYM_0001933 [ ZISP] .

Paralectotypes: ♂, <golden circle> // Hakodate , Japan, Albrecht [leg.] // 17.[0]7.18[97] // Arge rufocincta sp. nov ., ♂, Gussakovskij det. // DEI-GISHym 894445 // SYNTYPUS Arge rufocincta Guss., 1935 , ♂, teste A. Taeger 2018 // Zoological Institute St. Petersburg INS_HYM_0001935 [ ZISP] ; ♀, same labels as lectotype, but // DEIGISHym 89446 // Zoological Institute St. Petersburg INS_HYM_0001934 [ ZISP] ; ♂, same labels as lectotype, but // DEI-GISHym 89447 // Zoological Institute St. Petersburg INS_HYM_0001936 [ ZISP] .

Description. Female ( Fig. 36 View FIGURE 36 ). Body length 9.7 mm; fore wing length 9.1 mm.

Colour. Body black with light blue metallic lustre; 3rd, 4th and basal half of 5th abdominal segments orange. Hind tibiae in basal half yellowish-white, at apex blackened above preapical spurs. Tibiae of fore and middle legs, apex of mandibles dark brown. Wings hyaline, with weak, indistinct spot under pterostigma. Pubescence silvery white.

Head. Head behind eyes distinctly expanded. Distance between eyes 1.4 × vertical diameter of eye; eye with vertical diameter 1.9 × its horizontal diameter. Postocellar area slightly convex, with weak anterior and lateral furrows. POL: OCL: OOL as 1.5: 1.0: 1.3. Medial fovea flat, not deep, triangular, closed in upper part. Lateral carinae sharp, converging downwards, not connected to each other. Supraclypeal area slightly convex, sparsely punctured, smooth, shiny. Malar space about equal to diameter of frontal ocellus. Clypeus shiny, sparsely punctate, with medial semi-circular notch on ventral margin. Labrum with slightly concave ventral margin.

Antennae. Antennal length 1.8 × maximum head width; flagellum weakly curved, clearly extended to apex, apex narrowly rounded; its setae short, dense, adhering.

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

Legs. Middle and hind tibia with preapical spurs; tibial spurs simple. Basal tarsomeres of hind tarsus slightly shorter than next three combined.

Wings. In fore wing, cell 3Rs almost square, 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 with evenly spaced long setae. Wing margin between veins M and Cu ciliate, setae longer than width of vein M.

Abdomen. Abdomen oval (in dorsal view), basal tergites glabrous. Saw sheath length 1.3 × its width in ventral view, simple, parallel-sided, narrowly rounded at apex (ventral view), on inner surface with short, blunt spines; in lateral view triangular, acuminate at apex, almost straight on ventral margin.

Lance in lateral view strongly convex, narrowed at base, medially with well-defined annuli. Maximum width of lance greater than lancet width. Carina of apical part of dorsal margin well developed with finely, irregular and indistinct denticles, remaining part of dorsal margin with longitudinal shallow fossa. Lancet with straight dorsal and convex medially ventral margin. Annuli nearly straight and dorsally lightly inclined towards base. Annular spines (ctenidia) short, simple, several times shorter than width of annulus. Ventral margin with 24 well-distinct serrulae. Serrulae triangular, in apical half oblique, with irregular denticles. Between serrulae one (less often two unequal) short and straight pore canals of marginal sensilla.

Male ( Fig. 37 View FIGURE 37 ). Body length 8.2 mm; fore wing length 7.4 mm.

In colouration as female, but abdomen completely black with blue metallic lustre, head and thorax with light blue metallic lustre. Head behind eyes weakly constricted. Distance between eyes 1.3 × vertical diameter of eye; eye with vertical diameter 1.7 × its horizontal diameter. POL: OCL: OOL as 1.8: 1.0: 1.4. Lateral keels below joined together forming short blunt median carina. Antennal length 2.0 × maximum head width; flagellum curved at base, almost straight, with erect setae on anterior surface. Subgenital plate in ventral view with rounded posterior margin.

Genitalia as in Fig. 37j View FIGURE 37 , gonostipes broad, convex on inner margin, tapering towards apex. Harpe slightly narrowed at base, narrowed at apex, elongated, length 1.5 times width at base, evenly covered with setae. Valve of penis with valviceps simple, flat and broad, rounded at apex. Valviceps in dorsal view narrow, tapering towards apex, with small rounded lateral lobe in middle; in lateral view very broad and rounded, dorsally with deep rounded notch at base from ergot and strongly sclerotised dorsal margin, apical part and apical third of ventral margin weakly pigmented and widened. Ventral margin slightly notched in middle, membranous lobe weakly pigmented at base. Dorsal process (ergot) clearly visible, slightly curved.

Remark. The original description is based on 3 female and 2 male syntypes originating from Hakodate ( Japan) (translated from Gussakovskij 1935: 420). Two females and two males were found in ZISP. The female is here designated as the lectotype.