Nonea monkswort
Dichotomous table for leafminers
1a fleck mines; larva mines from a transportable case: Coleophora pennella
1b upper- or lower-surface gallery or blotch; larva mines from within the leaf => 2
1c galls, etc => Tables for all parasites per species
2a brown blotch; pupation outside the mine: Agromyza abiens
2b whitish gallery; pupation within the mine, in a, generally lower-surface, pupal chamber: Chromatomyia horticola