Arge kozlovi Gussakovskij, 1935

16. Arge kozlovi Gussakovskij, 1935

( Figs 20 View FIGURE 20 , 21 View FIGURE 21 )

Arge kozlovi Gussakovskij, 1935: 232 (key), 256–257 (description), 402 (key), 415–416 (description), ♂, ♀; Taeger et al. 2010: 132.

Current status. Arge kozlovi Gussakovskij, 1935 .

Type locality. China, Gansu, Eastern Nan-Shan, Bin-gou vill.

Lectotype (designated here): ♂, В [осточный]. Нань-шань, сел[о]. Бин-гоу, в Юж[ном]. Датунск[ом]. хребте [ China, Gansu, Eastern Nan-Shan, South Datunskiy Ridge, Bin-gou vill.], 25.07.[19]08, КоЗлов [ P.K. Kozlov leg.] // Arge kozlovi , m, ♂ (?), Gussakovskij det. // Zoological Institute St. Petersburg INS_HYM_0001917 [ ZISP].

Paralectotypes: ♀, <golden circle> // ЦЗосто, Алашан[ский]. хр[ебет]., Гоби [ China, Inner Mongolia, Alashan Range, Tszosto], 10.05.[1]908, КоЗлов [ P.K. Kozlov leg.] // Arge kozlovi , sp. nov ., ♀, Gussakovskij det. [lost]; ♂, same labels, but 23.05.[19]08 [lost].

Description. Male ( Fig. 20 View FIGURE 20 ). Body length 7.1 mm; fore wing length 7.0 mm.

Colour. Antennae, head, thorax black with strong metallic lustre. Legs black, only basal 2/3 of tibiae, and most part of tarsi of fore legs yellowish-white. Abdomen yellow, basal two tergites almost entirely black, except external margin. Mandibles and mouthparts reddish. Wings hyaline, slightly greyish, cell C darkened. Pubescence yellowish-white.

Head. Head behind eyes slightly constricted. Distance between eyes 1.3 × vertical diameter of eye; eye with vertical diameter 1.8 × its horizontal diameter. Postocellar area weakly convex, with weak anterior and lateral furrows. POL: OCL: OOL as 1.5: 1.0: 1.3. Medial fovea narrow, flat in lower part, with distinct rounded pit in upper part, open towards frontal area. Lateral carinae sharp, slightly convex below, indistinct at lower part, joined in small median carina reaching only to level of tentorial pit. Supraclypeal area slightly elevated with rare punctures. Malar space just less than diameter of frontal ocellus. Clypeus with shallow, angular but rounded notch along entire ventral margin.

Antennae. Antennal length 2.1 × maximum head width; flagellum narrow, slightly curved, narrowly rounded at apex. Antennal setae frontally long and recumbent, on posterior surface short and adjoining.

Thorax. Mesopleuron in lower part with glabrous band; scutellum slightly convex, 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 approximately equal to posterior margin, distinctly 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 setae. Wing margin between veins M and Cu ciliate, its setae equal to width of vein M.

Abdomen. Abdomen oval (in dorsal view), basal tergites almost glabrous. Subgenital plate in ventral view rounded flat.

Genitalia as in Fig. 20j View FIGURE 20 , gonostipes narrow. Harpe parallel at base, rounded at apex, elongated, length 1.5 × width at base, densely covered with tiny setae. Valve of penis with valviceps simple, flat, with blunt apex. Valviceps in dorsal view narrow, with small lateral lobe at base, rounded at apex; in lateral view broad, blunt at apex, weakly pigmented on ventral margin, with small semi-circular notch in middle. Dorsal process (ergot) clearly defined, curved towards apex.

Female ( Fig. 21 View FIGURE 21 ). Body length 7.0–8.0 mm (according to original description).

In colouration as male, but on abdomen only tergite 1 slightly darkened at base, saw sheath black with blue metallic lustre, on legs yellow colouration less distinct. Saw sheath length 1.5 × its width in ventral view; ventrally parallel-sided, wide, angular, pointed at apex, in lateral view simple, with narrowly rounded apex.

Lance in lateral view strongly convex, narrowed at base, uniformly covered with annuli barely recognizable at apex. Maximum width of lance equal to lancet width. Carina of apical part of dorsal margin very high and well pronounced with finely, indistinct denticles, remaining part of dorsal margin with longitudinal fossa. Lancet with straight dorsal and convex medially ventral margin. Annuli nearly straight and dorsally slightly inclined towards base, in apical part indistinct. Annular spines (ctenidia) short, simple, several times shorter than width of annulus. Ventral margin with 21 well-distinct serrulae. Serrulae triangular, with unequal sides, broadly rounded at apex, covered with small denticles. Between serrulae two unequal short and straight pore canals of marginal sensilla.

Remark. The original description is based on two females and one male syntypes originating from several collection sites in the “Nan-Shan, Datunskiy khrebet” (Eastern Nan-Shan, South Datunskiy Ridge) and “Tszosto, Alashanskiy khrebet” (Alashan Range) (translated from Gussakovskij 1935: 416). Only a single male (the lectotype) from Eastern Nan-Shan survived in the ZISP collection; both paralectotypes are reliably lost (Dr A. Shinohara, personal comm.). The description of the female made is based on preliminary photos by Dr Hideho Hara.