1a larva mines from a transportable case, making fleck mines => 2

1b larva mines from the inside => 3

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

2a larva in a helicoidal case: Apterona helicoidella

2b larva in hoary, tubular case: Coleophora pennella

3a mine small, of indefinite shape; older larva lives free among spun leaves: Cnephasia asseclana

3b mine not unusually smal; larve mines till just before pupation => 4

4a corridor from start to end; puparium in the mine; frass in well-spaced grains: Chromatomyia horticola

4b large, in the end brown, blotch without a preceding corridor => 5

4c narrow corridor, followed by a large blotch: Dialectica scalariella

5a larva solitary (always?): Agromyza myosotidis

5b larvae communal; common species: Agromyza abiens