Ulidia gongjuensis Chen, sp. nov.

Ulidia gongjuensis Chen, sp. nov.

(Figs 1–5, 12)

Type material. Holotype Ƥ: Gongjue, Xizang Province, China. 1976. VIII. 3, collected by Han Yinheng (IZCAS). Paratypes: 1Ƥ, same data as in holotype (IZCAS).

Diagnosis. Differing from all known species of Ulidia by the combination of following characteristics: 1) head longer than high, eye oblique oval; 2) parafacial twice as wide as flagellomere 1 and half as wide as gena; 3) head mostly yellow, except occiput, ocellar triangle and orbital plate black; 4) frons deeply dimpled; 5) wing hyaline with brownish yellow base and brown pterostigma, postero-dorsal extension of cell bcu shorter than transverse section of vein Cu2; 6) aculeus long, 7.5 times as long as wide, with elongate oval cercal unit and 2 pairs of long cercal setae.

Description. Wing length 3.8–4.1 mm. Body length 6.0– 6.2 mm. Head. (Figs 1–2). Frons brownish yellow except orbits black, slightly shining, densely but not long setulose and deeply dimpled. Ocellar triangle and vertical plates shining black. Facial carina, clypeus, antenna, parafacial and gena brownish yellow. Occiput black. Mouthparts dark brown to black. Head slightly elongate, width distinctly longer than high, eye oval, somewhat oblique. Frons 1.2 times as long as wide, almost parallel-sided. Gena about 2/3 times as high as eye. Parafacial wide, almost twice as wide as flagellomere 1 and half as wide as gena. Facial carina wider than antennal groove. Flagellomere 1 rounded apically, slightly longer than wide. Arista bare.

Thorax. Mesonotum entirely shining and black, with several rows of tiny acrostichal setulae. Scutellum shining black, with 2 pairs of setae; basal scutellar setae shorter than apical ones.

Wing. Hyaline, Cell bc and stigma dark brown, cell c brownish yellow, base of wing brownish-yellow, apex of wing slightly pale brownish. Postero-dorsal extension of cell bcu short, about 0.67 times the transverse section of vein Cu2; distance between R4+5 and M apices at wing apex wider than r-m crossvein; R- M slightly beyond the middle of cell dm (Fig. 5). Halter yellow brown.

Legs. Entirely black and shining except for the tarsi brown. All femur with a row of relatively long black ventral setae. Hind femur and hind tibia slightly thickened.

Abdomen. Black and shining, short and sparse black setulose. Female terminalia with 3 spherical spermathecae (Fig. 4), two of which have a common duct. Aculeus long, 7.5 times as long as wide, rounded at apex and with 2 pairs of long setae (Fig. 3).

Male. Unknown.

Distribution. China (Xizang).

Etymology. This species is named after the type locality.

Notes. Based on head expanded in front, head width distinctly more than height, frons deeply dimpled and wing posteroapical extension of cell bcu less than 1.0 times the transverse section of vein Cu2, this species seems to have a closer relationship with Ulidia xizangensis sp. nov. than with other two species of this genus in China.

Ulidia kandybinae Zaitzev (Fig 13)

Ulidia kandybinae Zaitzev, 1982: 425.

Diagnosis. Similar to other Ulidia species (U. melampodia Loew, U. salonikiensis Hennig, U. nigricubitalis Zaitzev and U. nigricubitalis Zaitzev) with brown subapical spot and pterostigma, differing from them by very short posteroapical lobe of bcu cell and yellowish foretarsi).

Description. Wing length 3.1–3.6 mm. Body length 4.0– 4.7 mm. Head. Shining black, except for face, anterior half of frons, parafacial and gena yellow to brownish yellow. Frons as long as wide, shining or subshining, sparsely dimpled and short setulose, with small spot of whitish microtrichia at anterior portion of orbit. Eye 1.1–1.2 times as high as long and 2.0–2.5 times as high as gena. Antenna yellow, flagellomere 1 round, brownish at apex. Palpus narrow black.

Thorax. Mesonotum black and shining, with 2–4 rows of tiny acrostichal setulae and prescutellar acrostichal seta absent. Scutellum shining black, with 2 pairs of setae; basalscutellar setae shorter than apical ones.

Wing. Hyaline. Cell bc and stigma dark brown, cell c brownish yellow. Subapical brown spot extending posteriorly beyond vein R4+5 to middle of cell r4+5. Posteroapical lobe of cell bcu very short, section of vein Cu2 between bend and vein A1 as long as or slightly shorter than section between fork of vein Cu and elbow. Halter yellow, except for base brown.

Legs. Black except for 4 basal tarsomeres, and fore- and midtibiae yellow; male hindfemur and hindtibia slightly thickened.

Abdomen. Shining black, short black setulose. Male tergite 5 with numerous transverse wrinkles, sternite 5 large semicircular, more than half as wide as abdomen. Male genitalia with surstylus having no posteromedial lobe or thickened setula. Female terminalia with aculeus relatively long, 7–10 times as long as wide; spermathecae lost in the only examined female specimen.

Material examined. Russia: Krasnoyarsk, 7 VII 1988, 23, 1Ƥ (Sugonyaev) (SIZK); Yakutsk, 29 VI 1962 (Zhelokhovtsev) (ZMUM). China: "Alashan" (Helanshan) Mountains, Gobi Desert, "Dzosto", 19 IV 1908, 1 specimen (sex unknown; abdomen missing) (Kozlov) (ZISP).

Distribution. China (Nei Mongol or Ningxia), Mongolia (type locality: Central Aimak, Zaisan at Bogdo- Ul Mountain), Russia (Siberia).