Key to Korean species of the genus Geranomyia Haliday, 1833

1. Wing unpatterned or with few small and indistinct spots on frontal margin besides large stigma (Figs. 2, 7).............. 2

-. Wing with few large and distinct spots on frontal wing margin and smaller spots behind them......................... 4

2. Thoracical pleuron with distinct longitudinal stripe...................................... Geranomyia piagola n. sp.

-. Thoracical pleuron without longitudinal stripe............................................................... 3

3. Wing with three small spots on frontal margin besides stigma. Rostral prolongation of inner gonostylus of male genitalia armed with two medium long spines starting from same tubercle....................... Geranomyia gifuensis Alexander, 1921

-. Wing unpatterned except stigma. Rostral prolongation of inner gonostylus of male genitalia armed with two long spines start- ing from separate tubercles (Figs. 3, 4)................................................ Geranomyia semjina n. sp.

4. Wing cells with lots of small spots, that are most abundant along vein Cu. Rostral prolongation of inner gonostylus of male genitalia armed with single long and arched spine............................ Geranomyia multipuncta Alexander,1922

-. Wing cells without small spots. Rostral prolongation of inner gonostylus of male genitalia armed with two short and straight spines.............................................................. Geranomyia neavocetta (Alexander, 1938)