Euonymus spindle tree
Dichotomous table for leafminers
1a a branching corridor; main section on top of the midrib; larva remains in the mine till just before pupation: Liriomyza strigata
1b small or large blotch; larvae soon leave the mine to live free => 2
1c galls, etc => Tables for all parasites per species
2a blotch small, full depth; older larvae, often in large numbers, in a collective spinning: Yponomeuta cagnagella
2b blotch large, upper surface; free-living larvae in a rolled leaf: Gracillaria syringella
Not included in the key: Scythropia crataegella.