Key to adults of Korean species of Limonia

1. Wing (Fig. 55) reduced, far from reaching tip of abdomen, especially in male. Wing with three dark spots at frontal margin and dark areas surrounding cord and distal margin of discal cell (Fig. 56).............. Limonia parvipennis Alexander, 1940

- Wing well developed, reaching at least tip of abdomen, usually distinctly beyond that (Figs. 5, 24, 37, 72). Wing pattern not as above.............................................................................................. 2

2. Vein Sc short, Sc1 ending slightly beyond base of Rs (Figs. 16, 17).................... Limonia juvenca Alexander, 1935

- Vein Sc longer, Sc1 reaching at least to about one third of Rs length, usually much further (Figs. 1, 6, 9, 11, 20, 25, 38, 41, 44, 73)................................................................................................ 3

3. Wing totally translucent, without any dark spots or smears, stigma indistinct, nearly missing (Fig. 11).................................................................................... Limonia fusciceps fusciceps Alexander, 1924

- Wing with dark spots or smears, including stigma (Figs. 1, 6, 9, 20, 25, 38, 41, 44, 73)............................. 4

4. Wing without smoky areas in cells (Figs. 1, 25, 73)..........................................................5

- Wing with smoky areas in cells (Figs. 6, 9, 20, 38, 41, 44).................................................... 7

5. Wing with distinct dark stigma, but without any additional dark spots (Fig. 25)... Limonia macrostigma (Schummel, 1829)

- Wing with dark spots besides stigma (Figs. 1, 73)........................................................... 6

6. Wing with three intensely dark spots at frontal margin and dark area surrounding Cu, costal cell translucent (Fig. 1).............................................................................. Limonia annulata Lackschewitz, 1940

- Wing with three dark spots at frontal margin and dark costal cell (Fig. 73)......................... Limonia pia sp. nov.

7. Femur with three dark rings. Male terminalia as in Fig. 45, ovipositor as in Fig. 46 ..... .. Limonia nubeculosa Meigen, 1804

- Femur with less than three dark rings. Male and female terminalia not as above....................................8

8. Femur with two distinct dark brown rings at distal end and indistinct darkening at middle...................................................................................................... Limonia episema Alexander, 1924

- Femur with distinctly darkened distal part and sometimes with indistinct darkening at middle........................ 9

9. Abdomen yellow......................................................... Limonia nemoralis Savchenko, 1983

- Abdomen brown..................................................................................... 10

10. Wing stigma uniformly dark (Fig. 20)........................................ Limonia karafutonis Alexander, 1924

- Wing stigma with light central part and dark margins (Figs. 6, 38).............................................. 11

11. Wing with intense dark spots in all cells (Fig. 38). Prescutum nearly entirely dark brown............................................................................................... Limonia messaurea messaurea Mendl, 1971

- Wing with indistinct cloudy spots in all cells (Fig. 6). Prescutum with three wide stripes... Limonia bidens Savchenko, 1979