Coleostephus
Dichotomous table for leafminers
1a long, narrow gallery, widening into a large blotch on top of the midrib: Trypeta zoe
1b long, narrow gallery, neither widening not associated with the midrib: Chromatomyia cf. syngenesiae; Phytomyza tanaceti
1c galls, etc => Tables for all parasites per species