Rudbeckia coneflower, blackeyed susan
Dichotomous table for leafminers
1a several small, roundish, full depth, mines in a leaf; larva with chitinised head: Phytosciara macrotricha
1b a single, upper- or lower-surface corridor of several cm length; larva a maggot => 2
1c galls, etc => Tables for all parasites per species
2a corridor pinnately branched, main and side branches on top of midrib and side veins; pupation outside the mine: Liriomyza strigata
2b corridor little, irregularly, branched; pupation within the mine, in a, generally lower-surface, pupal chamber: Chromatomyia cf syngenesiae