1a mine full depth; larva with thoracic feet and a sclerotised head => 2>

1b mine upper- or lower-surface, greenish in transparency; larva a maggot => 4

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

2a larva mines, living between two spun leaves: Scrobipalpa portosanctana

2b the larve mines from a silken tube, spun alongside the plant: Scythris buszkoi

2c the larve mines from within => 3

3a larva: green, head black: Microlechia chretieni

3b practically colourless, head light brown: Tuta absoluta

4a large, primary blotch: Pegomya hyoscyami

4b corridor, perhaps partly a secondary blotch => 5

5a pupation within the mine in a, usually lower-surface, pupal chamber; frass in grains: Chromatomyia horticola

5b pupation outside the mine; frass in strings: Liriomyza bryoniae