1a fleck mine => 2

1b corridor or blotch => 4

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

2a case resembles a grass spikelet => 3

2b case consists of a number of leaf fragments placed one behind the other, resembling a little saw zak: Coleophora onopordiella

3a case yellowish white, somewhat constricted behind the mouth: Coleophora lixella

3b case brown, not constricted behind the mouth: Coleophora ornatipennella

4a mine full depth; larva with feet and chtinised head; pupation outside the mine (Elachista) => 5

4b mine upper-surface; pupation within or outside the mine => 6

5a of the species mentioned below the mines are insufficiently diagnostic and the larvae of most are not well known. A key cannot be made: Elachista albifrontella, argentella, atricomella, cingillella, elegans, freyerella, lastrella, luticomella, maculicerusella, obliquella, nobilella, sicula, subnigrella

6a larva: mandible with 1 tooth; rear spiraculum drawn into a long point: Hydrellia griseola

6b mandible wth 2 or more teeth; rear spiraculum different => 7

7a larva: cephalic skeleton of Agromyzinae-type; pupation outside the mine ** => 8

7b cephalic skeleton of Phytomyzinae-type; pupation within or outside the mine => 11

8a larva: rear spiraculum with 3 papillae that are elongated and sigmoid: Agromyza intermittens

8b rear spiraculum not specialised in this way => 9

9a larva: behind the mandibles ventrally a field with spinulose warts; mandible with 2-3 teeth => 10

9b behind the mandibles no such field; mandible with 4 teeth (occurrence on this hostplant uncertain): Agromya albipennis

10a larva solitary; rear end of the cut off at right angle: Agromyza rondensis

10b larva communal; rear end cut off obliquely: Agromyza bromi, A. nigrella & A. mobilis

11a puparium within the mine => 12

11b pupation outside the mine => 16

12a puparium: front spiracula penetrate the epidermis => 13

12b puparium not in contact with the outside world => 15

13a puparium orange brown => 14

13b puparium shining black: Cerodontha muscina

14a puparium monochromous; front spiracula somewhat bifid: Chromatomyia nigra

14b puparium with a ventral dark length band; front spiraculum fist-shaped:: Chromatomyia fuscula

15a larva: the black warts at the outside of the rear spiracula small, without a ‘root’: Cerodontha incisa

15b these warts large with a deep ‘root’: Cerodontha pygmaea

16a larva: rear spiraculum with 3 papillae; puparium yellow: Liriomyza flaveola

16b rear spiraculum with 12-18 papillae; puparium brown: Cerodontha flavocingulata