1a blotch, possibly preceded by a narrow corridor => 2

1b corridor, possibly locally widened => 5

1c fleck mine => 7

1d small full depth mines of undefinable, variable shape; the older larvae live free, either between spun leaves or as causers of window feeding => 8

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

2a oviposition site, at the leaf margin, covered by a shining black drop of dried secretion; blotch, no initial corridor: Trachys scrobiculatus

2b no such drop; initial corridor present, but may have been be overrun by the later blotch => 3

3a frass in the corridor part in a broad green central band, with tiny black granules at either side: Amauromyza labiatarum

3b frass in the corridor in black grains or thread fragments => 4

4a frass in the entire corridor as neat thread fragments, alternating along the sides: Amauromyza lamii

4b frass in the corridor in shorter, untidily arranged thread fragments; towards the end more in grains: Amauromyza morionella

5a mine full depth: Apteropeda orbiculata

5b mine (almost) entirely upper- or lower-surface; greenish in transparancy => 6

6a mine pinnately branched, main branch overlying the midrib: Liriomyza strigata

6b mine not branched, not associated with the midrib: Phytomyza glechomae

7a greenish lobe case: Coleophora ochripennella

7b black-brown sheath case: Coleophora albitarsella

8a larva colourless-whitish, without thoracic feet: Phytosciara halterata

8b larva grey, thoracic feet present => 9

9a larva: pinacula colourless (the bases of the setae themselves are black) : Cnephasia incertana

9b pinacula black => 10

10a larva: behind/below the anus a chitinous comb: Cnephasia asseclana

10b anal comb absent: Cnephasia stephensiana