1a lower-surface tentiform mine => 2

1b fleck mine => 3

1c mine full depth; larva with chitinised head => 6

1d mine upper and/or lower-surface; larva a maggot => 7

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

2a pupa: cremaster spines just before the terminal hook wit a notch; abdomen segment 10 as broad as long: Phyllonorycter medicaginella

2b cremaster spines not notched; abdomen segment 10 broader than long: Phyllonorycter insignitella

3a larva mines from a case; opening in the mine more less circular => 4

3b larva doesn’t mine from a case; opening an untidy slit => 6

4a case helicoidal; opening not exactly circular: Apterona helicoidella

4b case not helicoidal; opening neatly circular: Coleophora ononidella

5a larva mine from a silken tube that is fixed to the leaf: Scythris siccella

5b larva entirely free under the leaf: Polyommatus icarus

6a mine initially linear, over the midrib, later widening, eventually occupying the full width of the leaflet; larva yellow or yellow-green, remaining in the leaf till just before pupation: Parectopa ononidis

6b small round blotch; after a while the larvae, with a white dorsal line, live free among spun leaves: Aproaerema anthyllidella

7a lower-surface blotch: Agromyza lathyri

7b corridor, may be widened at the end but never becoming a real blotch => 8

8a corridor pinnately branched, main branch overlying the midrib: Liriomyza strigata

8b corridor not pinnate, not associated with the midrib => 9

9a puparium in the mine, in a, usually lower-surface, pupal chamber: Chromatomyia horticola

9b puparium formed outside the mine => 10

10a frass in a broad green central band, with tiny grains at either side: Liriomyza congesta

10b frass in black string => 11

11a corridor usually entirely either upper- or lower-surface; in the end rarely a secodary blotch: Liriomyza cicerina

11b corridor usually under-surface at first, upper-surface later; in the end usually a secondary blotch: Liriomyza bryoniae