1a corridor, sometimes quite broad, overlying midrib and side veins => 2
1b corridor, not associated with leaf venation => 3
1c galls, etc => Tables for all parasites per species
2a corridor rather narrow, not varying in depth and width: Liriomyza strigata
2b corridor strongly varying in width and depth; especially on top of the midrib sometimes almost a blotch: Liriomyza xanthocera
3a pupation within the mine in a, usually lower-surface, pupal chamber; frass in well-separated grains: Chromatomyia horticola
3b pupation outside the mine; frass largely in strings or pearl chains: Liriomyza bryoniae
Not included in the key: Liriomyza trifolii.