1a pinnately branched corridor, main branch positioned over the midrib, side branches over the secondary veins: Liriomyza strigata

1b corridor not pinnately branched, not associated with the leaf venation => 2

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

2a frass in discrete grains; puparium formed in the mine, its front spiracles penetrate through the epidermis: Chromatomyia cf. syngenesiae

2b frass in pearl chains or strings; puparium formed after the mine has been vacated: Phytomyza conyzae