Dichotomous table for leafminers
1a pupation within the mine, in a, generally lower-surface, pupal chamber; frass in isolated grains: Chromatomyia cf. syngenesiae
1b pupation external; frass in strings => 2
1c galls, etc => Tables for all parasites per species
2a gallery pinnately branched, main and side branches on top of midrib and side veins: Liriomyza strigata
2b gallery less strongly branched, not pinnate: Liriomyza bryoniae
Not included in the key: Liriomyza trifolii.