1a frass in clear, widely isolated grains; pupation within the mine, in a, usually lower-surface, pupal chamber: Chromatomyia horticola

1b frass different; pupation external => 2

1c galls, etc => Tables for all parasites per species

2a frass in strings or pearl chains: Liriomyza cicerina

2b frass as a broad, green, central band, with tiny black grains at either side: Liriomyza congesta