Molinia purple moor-grass
(For a dichotomous table for galls on Molinia by Hans Roskam click here)Dichotomous table for leafminers
1a larva with chitinised head; in narrow segments of the corridor frass in a more or less narrow central line; pupation outside the mine: Elachista subalbidella
1b larva a maggot; in narrow parts the frass in two lines; puparium in the mine => 2
1c galls, etc => Tables for all parasites per species
Dichotomous table for leafminers
1a larva with chitinised head; in narrow segments of the corridor frass in a more or less narrow central line; pupation outside the mine: Elachista subalbidella
1b larva a maggot; in narrow parts the frass in two lines; puparium in the mine => 2
1c galls, etc => Tables for all parasites per species
2a puparium orange brown; front spiracula penetrate the epidermis: Chromatomyia nigra
2b puparium metallic black; spiracula not penetrating => 3
3a larva: the black warts at the outside of the rear spiracula small, without a root’: Cerodontha incisa
3b these warts large, with a deep ‘root’: Cerodontha pygmaea
Not included in the key: Agromyza albipennis; Cerodontha melicae