Key to adult males of the genus Natarsia

1. Wing membrane with extensive markings from dark macrotrichiae (Palaearctic) ......... .................................................................................................... N. punctata (Fabricius)

­ Wing membrane without extensive markings ... ........................................................... 2

2. Fore leg without beard (Nearctic) ............................................... N. miripes (Coquillett)

­ Fore leg with beard........................................................................................................ 3

3. Tarsomeres 1–5 uniformly brown.................................................................................. 4

­ Tarsomeres 1–5 with dark ring ...................................................................................... 5

4. Tergites II–V each with narrow brown basal band; tergites VI–VII nearly completely brown; tergites VIII–IX brown (Palaearctic, Oriental) ...................... N. nugax (Walker)

­ Tergites II–V each with roughly triangular brown area along anterior margin; tergites VI–VIII each with rounded brown area on anterior margin (Oriental)........................... ........................................................................................................... N. qinlingica sp. n.

5. Anal point present (Nearctic) ............................................... N. baltimoreus (Macquart)

­ Anal point absent (Palaearctic) ................................................... N. tokunagai (Fittkau) FIGS. 7–12. Natarsia qinlingica sp. n. 7, abdomen. 8, wing. 9, tibial spur and tibial comb on fore leg. 10, tibial spurs on mid leg. 11, tibial spur and tibial comb on hind leg. 12, hypopygium; dorsal view on left, ventral view on right.