Blackstonia yellow-wort
Dichotomous table for leafminers
1a mine a full depth blotch; larva with chitinised head: Stenoptilia zophodactylus
1b mine upper- or lower-surface, initially a corridor; larva a maggot: Chromatomyia blackstoniae
1c galls, etc => Tables for all parasites per species
Not included in the key: Chromatomyia horticola.