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