1a mine full depth; larva with well recognisable head => 2

1b mine uper and/or lower-surface; larva a virtually headless maggot => 5

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

2a larva without feet; glassy => 3

2b larva with distinct feet; not transparent => 4

3a older larvae live free, causing window feeding: Phytosciara halterata

3b larve mine life long: Phytosciara macrotricha.

4a mine small; older larvae live free, among spun leaves; larvaL head brown: Cnephasia stephensiana

4b mine large; larve mines life long; head black: Agonopterix senecionis

5a mine narrow or wide, positioned over the midrib => 6

5b rather narrow corridor, not associated with the midrib => 7

6a wide brownish corridor; primary and secondary feeding lines conspicuous; most frass in discrete grains: Trypeta zoe

6b corridor rather narrow, whitish; no apparent feeding lines; frass in strings: Liriomyza strigata

7a puparium in the mine, in a, usually lower-surface, pupal chamber: Chromatomyia cf. syngenesiae

7b pupation after the larva has left the mine (through a semicircular exit slit) => 8

8a mountain species; larva: rear spiraculum with c. 19 papillae: Phytomyza aronici

8b lowland species; rear spiraculum with c. 28 papillae: Phytomyza doronici