Arge forficula Jakowlew, 1891

13. Arge forficula Jakowlew, 1891

( Fig. 18 View FIGURE 18 )

Arge forficula Jakowlew, 1891: 17–18 , ♀.

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

Type locality. China, Gansu, Dzhani.

Lectotype (designated here): ♀, <golden circle> // Ганьсу, Джани [ China, Gansu, Dzhani], 4.04.[18]85, Потанин [ G.N. Potanin leg.] // к.[оллекциЯ] А. Яковлева [Collection of A.I. Jakowlew] // DEI-GISHym 89417 // Paralectotypus Arge forficula Jakowlew, 1891 , vide A. Taeger 2018 // Zoological Institute St. Petersburg INS_ HYM_0001917 [ ZISP] .

Paralectotype: ♀, <golden circle> // Ганьсу, Джани [ China, Gansu, Dzhani], 4.04.[18]85, Потанин [G.N. Potanin leg.] // Hylotoma forficula Yak [owlew]. // к.[оллекциЯ] А. Яковлева [Collection of A.I. Jakowlew] // LECTOTYPE Arge forficula Jakovlew , ♀, Des. M. Wei ‘[20]14 <red label> // Arge simillima (Smith, 1874) , ♀, Det. M.C. Wei, 2014 // DEI-GISHym 89416 // designation not yet published, det. A. Taeger 2018 // Arge forficula Yak [owlew]., Lectotype (in litt.) // Zoological Institute St. Petersburg INS_HYM_0001918 [ ZISP].

Description. Female ( Fig. 18 View FIGURE 18 ). Body length 11.0 mm; fore wing length 9.7 mm.

Colour. Body completely black, only on abdomen with barely visible blue metallic lustre; legs, apex of mandibles dark brown. Wings hyaline, slightly and indistinctly darkened at base, cell C darkened, veins and pterostigma dark brown. Pubescence black.

Head. Head behind eyes slightly expanded. Distance between eyes 1.3 × vertical diameter of eye; eye with vertical diameter 1.7 × its horizontal diameter. Postocellar area slightly convex, with weak anterior furrows. POL: OCL: OOL as 1.2: 1.0: 1.5. Medial fovea in lower part flat, not deep, roundly impressed in upper part. Lateral carinae in upper part blunt, roundly converging and joining; in lower part sharp, almost parallel, at end indistinctly joining into distinct median carina. Supraclypeal area not convex. Malar space less than diameter of frontal ocellus. Clypeus medially with small semi-circular notch on ventral margin. Labrum with concave ventral margin.

Antennae. Antennal length 1.7 × maximum head width; flagellum weakly curved, apex broadly rounded. Antenna densely covered with short setae.

Thorax. Mesopleurae in lower part with glabrous band; scutellum flat, broadly 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 slightly longer than posterior margin; strongly widened to external margin. Vein 3r-m angularly curved at obtuse angle. 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 slightly longer than vein M.

Abdomen. Tergites strongly transversely wrinkled. Abdomen elongate, oval. Saw sheath length 2.5 × its width in ventral view. Saw sheaths long, complex, claw-shaped, with sharp projection in middle in ventral view; narrow, strongly protruding beyond apex of abdomen, medial part rounded laterally.

Lance in lateral view long and very narrow, with almost parallel sides, covered whole length with clearly distinguishable and strongly curved at base annuli. Maximum width of lance slightly narrower than lancet width. Carina of apical part of dorsal margin barely visible, remaining part of dorsal margin with longitudinal shallow fossa. Lancet with sigmoidal dorsal and convex ventral margin. Annuli curved and dorsally inclined towards apex, in apical part indistinct. Annular spines (ctenidia) short, simple, 0.3 × as long as width of annulus. Ventral margin with 26 barely distinguishable serrulae. Serrulae triangular, many times smaller than distance between them; entire dorsal margin covered with small indistinct denticles. Between serrulae one (less often two unequal) straight and very long pore canals of marginal sensilla.

Remark. The designation of the lectotype by Dr M.C. Wei has not been found in the literature, so the lectotype should be considered unpublished. The best safety specimen is designated here as the lectotype; the paralectotype is strongly discoloured.

The original description is based on two females from “Gan-ssu” ( China, Gansu) (translated from Jakowlew, 1891: 18). They were found in ZISP. One of them is here designated as the lectotype .