1a frass in isolated granules; pupation within the mine: Phytomyza cf syngenesiae

1b most frass in pearl chains or thread fragments; pupation external => 2

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

2a gallery pinnately branced; main and side branches on top of midrib and lateral veins: Liriomyza strigata

2b gallery independent of the leaf venation: Liriomyza trifolii