Dicranota ( Dicranota ) yezoensis Alexander, 1924

Dicranota ( Dicranota) yezoensis Alexander, 1924 View in CoL

Figs 16–18 View Figures 16–18 , 80 View Figures 77–93

Dicranota yezoensis Alexander, 1924: 571. View in CoL

Dicranota ( Dicranota) yezoensis View in CoL : Savchenko and Krivolutskaya 1976: 47, fig. 17 b; Savchenko 1989: 18.

Type material examined.

Japan • Holotype ♂ (pinned, wing and genitalia slide mounted); Hokkaido, Akan ; 4 September 1922; T. Esaki leg.; USNM .

Other examined material

(Fig. 80 View Figures 77–93 ). North Korea • 1 ♂ (antenna, hind leg, wing and abdomen slide mounted); Kankyo Nando , Puksu Pyaksan; alt. 1219 m; 14 August 1939; A. M. Yankovsky leg.; C. P. Alexander det.; USNM .

Redescription.

General body colouration dark brownish grey. Body length of male 6.3 mm, wing length 7.0– 8.1 mm.

Head. Brownish grey, narrowly pale grey along eye margin. Male antenna reaching to approx. middle between base of wing and halter if bent backwards. Antennal flagellum 10 - segmented, uniformly shiny black, basal flagellomere elongate, succeeding flagellomeres oval, decreasing in length towards apex of antenna. Flagellum covered with white pubescence, apical segment very small.

Thorax. Dark brownish grey. Presutural scutum with three darker stripes. Median stripe with narrow light vitta along middle. Scutal lobe grey with pale brown spot. Scutellum and mediotergite light grey. Pleuron uniformly pale grey. Wing (Fig. 16 View Figures 16–18 ) widest at tip of vein CuP, translucent, strongly iridescent, with brownish tinge. Stigma distinct, dark brown, elongate. Dark spot at base of R 5 and cross-vein r-m distinct, less distinct darkening at base of Rs. Veins brown, yellowish at wing base. Venation: Sc long, tip reaching wing margin beyond base of stigma, sc-r short distance beyond level of A 1 tip. Rs short, angulated and short-spurred. Free end of R 1 nearly as long as R 2. Vein R 2 transverse, at distal margin of stigma, supernumerary cross-vein in cell r 1 at frontal margin of stigma. R 3, R 4, and R 5 nearly parallel to each other distally. Cell r 3 with short stem. Cross-vein r-m distinct. Discal cell present in holotype, but cross-vein m-m very weak. Korean specimen has open discal cell with only part of m-m present. Cell m 1 large. Cross-vein m-cu 1 / 2–2 / 3 of its own length beyond branching point of M, CuP slightly sinuous, nearly straight, anal vein slightly arched. Anal angle widely rounded. Length of male halter 0.9 mm. Halter brown with paler stem. Coxae light grey with yellowish distal part. Trochanters dull yellow with blackened distal margin. Femora brown, paler at base, darker towards apex. Tibiae brown, slightly darker towards distal end, tarsomeres dark brown. Male femur I: 3.8 mm long, II: 3.5 mm, III: 4.3 mm, tibia I: 4.5 mm, II: 4.8 mm, III: 4.8 mm, tarsus I: 5.6 mm, II: 4.9 mm, III: 4.7 mm.

Abdomen. Dark brownish grey, tergites with narrowly pale caudal margin, sternites with yellowish grey caudal margin. Abdomen ventrally with indistinct broken median yellowish stripe.

Male terminalia (Figs 17 View Figures 16–18 , 18 View Figures 16–18 ). Epandrium with caudal margin slightly sinuous, postero-lateral angle without additional structures. Gonocoxite short and wide with rounded setose postero-dorsal lobe. Interbase long and narrow, slightly arched. Outer gonostylus fleshy and setose, spindle-shaped. Inner gonostylus elongate, pale, with low wide lobule at ~ 1 / 3 of gonostylus length on mesal margin. Aedeagus (Fig. 18 View Figures 16–18 ) with elongate distal part and with two pairs of lateral apodemes, dorsal apodeme narrow, similar to that of D. guerini , but with distinct shoulder.

Elevation range.

Korean specimen was taken slightly above 1200 m.

Period of activity.

Adults fly from middle of August to beginning of September.

Habitat.

Unknown.

General distribution.

Species was recorded from Hokkaido Island ( Japan), Sakhalin and Kuril Islands ( Russia).

Remark.

Species was recorded only on islands, it was unknown from the continent. Species recorded from the Korean Peninsula for the first time.