1a entire mine full depth, very transparant; larva with chitinised head => 2

1b mine (mostly entirely) upper- or lower-surface; larva a maggot => 3

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

2a mine < 1 cm; larva, with thoracic feet, later lives free, causing window feeding: Plutella xylostella

2b mine longer; larva without feet, remaining in the mine till just before pupation: Ceutorhynchus minutus

3a blotch mine, with lobe-like extension; there the frass, as clouds of dark green dust: Scaptomyza flava

3b corridor mine; frass in black grains or strings => 4

4a frass in widely spaced grains; puparium in the mine in a, usually lower-surface, pupal chamber: Chromatomyia horticola

4b frass in strings or pearl chains; pupation outside the mine => 5

5a corridor pinnately branched, main branch overlying a thick vein => 6

5b corridor little or not branched, not associated with a thick vein => 7

6a main branch of the mine a slender corridor: Liriomyza strigata

6b main brand broad, somewhat of an elongated blotch: Liriomyza xanthocera

7a larva: rear spiraculum with 3 papillae: Liriomyza brassicae

7b rear spiraculum with 7-12 papillae: Liriomyza bryoniae