1a tentiform mine => 2

1b blotch, or something between blotch and corridor => 3

1c slender corridor from start to end => 12

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

2a mine strongly inflated, almost the entire leaflet folding over it; upper surface mottled white; pupa: cremaster with two pairs of thorns that are set close together; especially the outer pair stout: Phyllonoryter nigrescentella

2b mine weakly inflated, its upper surface largely green; cremaster with two pairs of thread-thin spines, not set close together: Phyllonoryter insignitella

3a ‘corridor-blotch’; larva with chitinised head; larvae later live free between spun leaves => 4

3b clear blotch, may have a narrow initial corridor; larva a maggot, remaining in the mine till pupation => 7

4a larva dark, limits between the thoracic segments whitish: Aproaerema anthyllidella

4b larva entirely dark => 5

5a larva: pinacula colourless (only the base of the setae black): Cnephasia incertana

5b pinacula black => 6

6a larva: segment 10 with an anal comb: Cnephasia asseclana

6b segment 10 without an anal comb: Cnephasia stephensiana

7a blotch without a trace of a preceding corridor: Agromyza viciae

7b blotch with an initial corridor => 8

8a initial corridors follows the leaf margin => 9

8b initial corridor independent of the leaf margin => 10

9a blotch full depth; frass in a few black lumps: Agromyza vicifoliae

9b blotch with a few full depth patches only; frass in small grains: Agromyza bicophaga

10a frass in coarse lumps; larva: cephalic skeleton of Agromyzinae-type => 11

10b frass in granules or strings; cephalic skeleton of Phytomyzinae-type: Liriomyza xanthocera

11a larva: rear spiraculum with 3 papillae: Agromyza nana

11b rear spiraculum with about 40 papillae: Agromya lathyri

12a puparium in the mine, in a, usually lower-surface, pupal chamber: Chromatomyia horticola

12b before pupation the mine is vacated through a semicircular exit slit => 13

13a frass in black strings: Liriomyza strigata

13b frass in a broad, green central band: Liriomyza congesta