Dicraeus rossicus Stackelberg, 1955

Liu, Xiaoyan, Yang, Ding & Nartshuk, Emilia P., 2019, New species and records of Dicraeus Loew, 1873 from China (Diptera: Chloropidae), Zootaxa 4554 (2), pp. 351-370 : 366-369

Dicraeus rossicus Stackelberg, 1955

Figs 11 , 37 , 43

Discraeus rossicus Stackelberg, 1955: 332 . Type locality: Russia (Leningrad Province).

Description. Head black ( Fig. 11 ), 0.85 times as long as high in profile; frons brown with distal 1/2 yellow, as long as wide; gena yellow, broad, 0.7 times as wide as first flagellomere; ocellar triangle black, reaching anterior 2/3 of frons, with pointed apex. Antenna yellow except for dorsal margin of first flagellomere black; first flagellomere 0.9 times as long as wide; arista brown with short brown pubescence. Proboscis brown to yellow, palpus brown. Scutum black, 1.1 times as long as wide. Thoracic pleuron shiny blackish brown. Scutellum black, 0.5 times as long as wide. Coxae and trochanters yellow, femora black except for distal 1/3 of fore femur, distal 1/4 of mid femur and distal portion of hind femur yellow, fore and mid tibiae yellow, hind tibia black with both ends yellow, tarsus yellow with fore tarsomeres 4–5, mid and hind tarsomeres 3–5 brown. Wing hyaline, 2.5 times as long as wide; veins brown. Relative lengths of 2nd: 3rd: 4th costal sections = 6: 2: 1. Halter pale yellow. Abdomen brown except for tergite 1 yellow with a pair of brown apico-lateral spots. Male genitalia ( Figs. 37 , 43 ): Epandrium brown, height 1.3 times width in profile; cercus narrowed, finger-like; surstylus as long as epandrium, distal 1/4 suddenly widened, round and narrow apically, with some long setulae on inside of distal widened part.

Female. Body length 2.8–3.4 mm, wing length 2.3–2.8 mm. External characteristics similar to male.

Specimens examined. 1 6, CHINA, Beijing, Yanqing, Songshan Mountain , 15. VII. 2003, Dakang Zhou Leg. ( CAU); 1 6 , CHINA, Guangdong, Ruyuan, Nanling, 23. VII. 2003, Shuwen An Leg. ( CAU); 4 ♀♀ , CHINA, Yunnan, Kunming, Dianchi, Xishan Mountain , 9. VII. 2006, Xingyue Liu Leg. ( HZAU); 1 6 , CHINA, Ningxia, Liupanshan Mountain, Qiuqianjia, 7. VII. 2008, Jingxian Liu Leg. ( HZAU); 28 66, 13 ♀♀ , CHINA, Beijing, Yanqing, Songshan Mountain , 2. VI. 2009, Qifei Liu Leg. ( CAU) (photo and abdomen dissected); 1 6 , CHINA, Hebei, Xiaowutai, Yangjiaping, Tangjiachang , 25. VI. 2009, Junchao Wang Leg. ( HZAU); 1 ♀ , CHINA, Hebei, Xiaowutai, Yangjiaping, Tangjiachang , 25. VI. 2009, Shan Huo Leg. ( HZAU); 2 66, 1 ♀ , CHINA, Hebei, Xiaowutai, Yangjiaping, Hejiagou , 27. VI. 2009, Junchao Wang Leg. ( HZAU); 1 ♀ , CHINA, Hebei, Xiaowutai, Yangjiaping, Haojiagou , 29. VI. 2009, Junchao Wang Leg. ( HZAU); 2 66, 1 ♀ , CHINA, Hubei, Shennongjia, Pingqian , 8. VII. 2009, Qifei Liu Leg. ( HZAU); 1 6 , CHINA, Hubei, Shennongjia, Yinyuhe, 18. VII. 2009, Qifei Liu Leg. ( HZAU); 10 66, 5 ♀♀ , CHINA, Guizhou, Suiyang, Kuankuoshui, Zhongxinzhan , 3. VI. 2010, Dan Zhou Leg. ( HZAU); 11 66, 28 ♀♀ , CHINA, Guizhou, Suiyang, Kuankuoshui, Zhongxinzhan , 3. VI. 2010, Yan Li Leg. ( HZAU); 1 6 , CHINA, Guizhou, Suiyang, Kuankuoshui Reservior, 4. VI. 2010, Yan Li Leg. ( HZAU); 5 66, 2 ♀♀ , CHINA, Guizhou, Suiyang, Kuankuoshui Reservior, 5. VI. 2010, Yan Li Leg. ( HZAU); 3 66, 2 ♀♀ , CHINA, Guizhou, Suiyang, Kuankuoshui, Zhongxinzhan , 5. VI. 2010, Dan Zhou Leg. ( HZAU); 2 ♀♀ , CHINA, Sichuan, Emeishan Mountain, Linggongli, 29. VI. 2010, Tao Li Leg. ( HZAU); 5 66, 3 ♀♀ , CHINA, Qinghai, Qilian, Xijiao, 12. VII. 2011, Sipei Liu Leg. ( HZAU); 6 66, 2 ♀♀ , CHINA, Qinghai, Arou, Daotang river, 13. VII. 2011, Sipei Liu Leg. ( HZAU); 1 ♀ , CHINA, Gansu, Sunan, Xiliugou , 8. VII. 2011, Sipei Liu Leg. ( CAU). All specimens were stored in 75% ethanol .

Distribution. China (Beijing, Guangdong, Yunnan, Ningxia, Hebei, Hubei, Guizhou, Sichuan, Qinghai, Gansu); Japan; Russia (from European part to Far East); Mongolia; Czech and Slovak Republics; Estonia; Finland; Hungary; Switzerland, France.

Remarks. The species is somewhat similar to D. stackelbergi Nartshuk, 1967 , but can be separated from the latter by the surstylus as long as epandrium in lateral view, with some long setulae on inside of distal widened part. In D. stackelbergi , the surstylus is distinctly shorter than epandrium in lateral view, with some thickened setae on inside of distal widened part ( Nartshuk 1967).

Figures

FIGURES 6–11. Dicraeus species, habitus. 6 D. fuscipennis Kanmiya; 7 D. malaise Nartshuk; 8 D. nartshukae Kanmiya; 9 D. orientalis Becker; 10 D. Phyllostachyus Kanmiya; 11 D. rossicus Stackelberg. Scale bar = 1 mm.

FIGURES 32–37. Dicraeus species, male. epandrium, posterior view. 32 D. fuscipennis Kanmiya; 33 D. malaise Nartshuk; 34 D. nartshukae Kanmiya; 35 D. orientalis Becker; 36 D. phyllostachyus Kanmiya; 37 D. rossicus Stackelberg. Scale bar = 0.1 mm.

FIGURES 38–43. Dicraeus species, male. epandrium, lateral view. 38 D. fuscipennis Kanmiya; 39 D. malaise Nartshuk; 40 D. nartshukae Kanmiya; 41 D. orientalis Becker; 42 D. phyllostachyus Kanmiya; 43 D. rossicus Stackelberg. Scale bar = 0.1 mm.