Cynoglossum hound’s-tongue
Dichotomous table for leafminers
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