Leaf-mine: A long linear mine, normally starting on lower surface, frass in black strips alternately at sides of mine (Spencer, 1972: 58).

Long whitish corridor, almost always lower-surface at first, then becoming largely or totally upper-surface. Because lower- and upper-surface tracts often cross the leaf looks distinctly mottled whe held against the light. The final part of the corridor is generally upper-surface. The corridor often follows a thick vein for a considerable distance. Frass in alternating thread fragments. Pupation outside the mine (Bladmineerders van Europa).

Larva: Posterior spiracles each with 7 bulbs (Spencer, 1972: 58). The larva is illustrated in Bladmineerders van Europa.

Puparium: Details unknown.

Hosts in Britain:

Hosts elsewhere:

Time of year - mines: July-August.

Time of year - adults: Unknown.

Distribution in Great Britain and Ireland: Kent (Hayes), Surrey (Chipstead), Hertfordshire (Potter's Bar) (Spencer, 1972: 58) and Warwickshire (Robbins, 1983).

NBN Grid map:

Distribution elsewhere: Widespread in continental Europe including The Netherlands, Belgium, Luxembourg (Bladmineerders van Europa), Corsica, Czech Republic, French mainland, Germany, Lithuania and Poland (Martinez in Fauna Europaea).

NBN interactive distribution map(s) of known host species in Great Britain and Ireland and elsewhere:

Parasitoids in Britain and elsewhere: Unknown.