Risa flavicoxa, Krivosheina & Ozerov, 2019

Krivosheina, M. G. & Ozerov, A. L., 2019, To the fauna of Risa Becker, 1907 (Diptera: Ephydridae) of Central Asia, Russian Entomological Journal 28 (2), pp. 192-194 : 194

KEY TO THE SPECIES OF RISA BECKER OF CENTRAL ASIA

1. Palpus yellow .................................................................. 2

– Palpus black ..................................................................... 3

2. Fore coxa black. Ocellar triangle short, slightly protruding beyond the middle of frons. Postocellar setae present ...................................................... R. flavipalpis Ozerov

– Fore coxa yellow. Ocellar triangle long, reaching lunule. Postocellar setae absent ...................... R. flavicoxa sp.n.

3. Postpedicel 3 times as long as wide ................................. ...................................................... R. longicornuta Papp

– Postpedicel 1.5–2.0 times as long as wide ...................... 4

4. Thorax subshining with greenish reflection. Ocellar triangle narrow and short, slightly protruding beyond the middle of frons .................................. R. asiatica Ozerov

– Thorax black, greyish dusted. Ocellar triangle wide and long, reaching lunule .................. R. longirostris Becker

Acknowledgements. The work was conducted within the state project No AAAA-A16-116021660077-3 (A.L. Ozerov) and partly supported by the program “Biodiversity” (M.G. Krivosheina). The authors are very grateful to Dr. Olga Ovchinnikova (ZISP) and Mrs. Galina Suleymanova (ZISP) for the loan of the material of Risa for study.