4. Limonia stigma (Meigen, 1818) Figures 26-28, 29-32, 33-34

Limnobia stigma Meigen 1818: 138.

Limnobia terrestris Linnaeus 1758: 586 (synonymy).

Limnobia sexnotata Schumme 1829: 111 (synonymy).

Limnobia punctigera Walker 1856: 298 (synonymy).

Diagnosis.

Flagellar verticils black, 1.6 times longer than corresponding segment. Prescutum with one triangular, brown longitudinal stripe. Wing pale brown, with one small grayish black marking at R2; Sc1 apically reaching 1/2 of Rs. Gonocoxite long cylindrical. Gonostylus with sharp apex and swollen, hairy base. Paramere with fan-shaped base and blunt apex that ends at 1/2 of aedeagus. Aedeagus with Y-shaped pattern at mid-ventral margin. Female, hypogynial valve 2.3 times longer than wide at base.

Redescription.

Male (n = 19): body length 7-9 mm, wing length 8-9 mm.

Head yellow (Figs 26-28). Vertex yellow. Occiput dull yellow, covered with black setulae. Antenna yellow and 14-segmented; scape yellow; pedicel oval; flagellomeres cylindrical and bicolor, brown at base and pale yellow at apex; flagellar verticils black, 1.6 times longer than corresponding segment. Rostrum and nasus pale yellow, nasus 1/4 as long as rostrum. Labella pale yellow, with black setulae, except inner margin brown. Palpi yellow except terminal segment brown.

Thorax mostly yellow (Figs 17, 18). Cervical sclerite yellow with black margin at antero-lateral margin. Pronotum dark brown, with black setulae. Prescutum with one brown, triangular longitudinal stripe (anterior part wider than posterior part); two setulae and longitudinal rows at middle. Scutum pale yellow, with black, oblique setulae at middle. Scutellum white. Mediotergite pale yellow, variegated with white (Fig. 27). Mesopleura pale yellow to yellow; subspiracular sclerite yellow; katepisternum with black setulae. Legs with coxae and trochanters yellow; femora dull yellow with one dark-brown subapical ring; tibiae brown with dark-brown subapical ring; tarsi brown to dark brown. Setulae on legs black. Wing hyaline, pale brown with one small grayish black marking at R2; Sc1 apically reaching 1/2 of Rs; basal deflection of CuA1 before branching point of M (Fig. 28). Halter dull yellow; knob bicolor, with upper part dull yellow and lower part white (Fig. 26).

Abdomen mainly yellow (Fig. 26). Sternite 7 reddish brown. Each abdominal segment with one pale-brown ring at posterior margin. Abdomen covered with golden setulae.

Hypopygium yellow (Fig. 26). Posterior margin of tergite 9 emarginated (Fig. 29). Gonocoxite long cylindrical. Gonostylus with sharp apex and swollen and hairy base (Figs 29, 30). Paramere with fan-shaped base and blunt apex that ended at 1/2 of aedeagus (Figs 29-32). Aedeagus forked; ventral margin with mid-protrusion triangular in lateral view; unique Y-shaped pattern at middle that anterior margin with short mid-protrusion (Figs 20-23).

Female (n = 11): body length 7.5-9 mm, wing length 7.5-10 mm.

Female resembling male in head, thorax, and wing. Female terminalia pale yellow. Cercus yellowish brown, slightly arched dorsally at apex, slender, and 3 times longer than wide at base. Hypogynial valve 2.3 times longer than wide at base; lateral margin with triangular black marking (Figs 33, 34).

Material examined.

6 males, China: Xinjiang, Burqin, Hemu, 48.43N, 87.57E, elev. 1040 m, 2016.VII.21, Jinlong Ren (CAU). 13 males, 2 females, China: Xinjiang, Burqin, Hemu, 48.58N, 87.45E, elev. 1160 m, 2016.VII.21, Jinlong Ren (CAU). 32 males, 16 females, China: Xinjiang, Burqin, Hemu, 48.56N, 87.44E, elev. 1150 m, 2016.VII.22, Jinlong Ren (CAU). 10 males, 3 females, China: Xinjiang, Burqin, Hemu, 48.56N, 87.44E, elev. 1200 m, 2016.VII.23, Jinlong Ren (CAU).

Distribution.

Armenia, Austria, Belarus, Belgium, Bulgaria, China (Xinjiang: Burqin), Czech Rep., Denmark, Estonia, Finland, France, Germany, Great Britain, Hungary, Italy, Lithuania, Netherlands, Poland, Romania, Russia, Slovakia, Slovenia, Sweden, Switzerland, Ukraine.

Remark.

This is the first report of this species from China.