Dichotomous table for leafminers
1a pinnately branched corridor overlying the midrib and strong lateral veins: Liriomyza strigata
1b mine not associated with the strong veins => 2
1c galls, etc => Tables for all parasites per species
2a frass in grains that are about separated by their own diameter, never in strings; mine very shallow; puparium in the mine, in a, usually lower-surface, pupal chamber: Chromatomyia horticola
2b frass in strings; mine deeper; pupation outside the mine: Liriomyza valerianae
Not included in the key: Cnephasia incertana.