1a small (< 1 cm) blotch or broad corridor, eventually with an excision: Incurvaria praelatella

1b full depth blotch without an intial corridor: Fenella nigrita

1c corridor, may terminate in a blotch => 2

1d fleck mine => 9

1e mines small, full depth, of undefinable shape; the older larvae live free among spun leaves => 12

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

2a mine upper- or lower-surface; frass in two rows; larva a maggot; no egg shell at start of the mine => 3

2b mine full depth; frass in a central line; larva with chitinised head; at start of the mine a shining globular egg shell => 5

3a a corridor from start to end: Agromyza filipendulae

3b corridor ending in a primary of secondary blotch => 4

4a in the corridor part of the mine frass in two rows of grains; larva: rear spiraculum with 3 papillae: Agromyza idaeiana

4b frass almost filling the initial corridor; rear spiraculum with 6 papillae: Agromyza sulfuriceps

5a on Filipendula ulmaria and vulgaris Stigmella filipendulae

5b only on Filipendula vulgaris => 6

6a larva greenish white, lying venter-upwards in the mine => 7

6b larva yellow, venter-downwards => 8

7a gallery in the end strongly widened: Ectoedemia angulifasciella

7b gallery narrow to the end: Ectoedemia hexapetalae

8a egg usually at the upperside of he leaf; gallery slender: Stigmella splendidissimella

8b eaa at the underside; gallery slender, widened at the end: Stigmella thuringiaca

9a lobe case => 10

9b spatulate leaf case => 11

10a case brown; mouth angle 0°-10°: Coleophora violacea

10b case usually whitish; mouth angle 30°-50°: Coleophora potentillae

11a case pale: Coleophora albicostella

11b case rust-coloured or blackish: Coleophora spiraeella

12a larva: pinacula colourless (the bases of the setae themselves are black) : Cnephasia incertana

12b pinacula black: Cnephasia stephensiana