1a mine upper- and/or lower-surface => 2

1b mine essentially full depth, transparant: Hypurus bertrandi

1c the larva mines from a transportable case: Coleophora texanella

1d galls, etc => Tables for all parasites per species

2a narrow corridor, continued in a blotch; larva a maggot: Scaptomyza graminum

2b corridor from start to end: Liriomyza trifolii