1a mine full depth; larva with chitinised head: Comasinus insignus

1b mine upper- or lower-surface; larva a maggot => 2

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

2a main part of the mine (corridor or elongated blotch) positioned over the midrib => 3

2b mine an (almost) unbranched corridor, not associated with the midrib => 4

3a main axis of the mine a corridor; larva: rear spiraculum with 10-13 papillae: Liriomyza strigata

3b main axis an elongated blotch; rear spiraculum with 3 papillae: Liriomyza xanthocera

4a frass in strings: Liriomyza valerianae

4b frass in isolated grains => 5

5a puparium in the mine, in a, usually under-surface, pupal chamber; larva: rear spiraculum with 6-9 papillae: Chromatomyia horticola

5b pupation outside the mine; rear spiraculum with 3 papillae: Liriomyza valerianellae