Leaf-mine: Larvae either singly or several in leaf, then forming large blotch-mine, feeding first up and then down the leaf. Pupation external (Spencer, 1976: 119).

Shallow upper-surface corridor, without full-depth sections, starting high in the leaf. Initially the corridor runs up, but soon it changes direction, quickly widening. In Deschampsia generally one mine per leaf, occupying its entire width; in Glyceria there mostly are serveral mines that merge in the end. Pupation outside the mine; the puparium often sticks to the leaf (Bladmineerders van Europa).

Larva: The larva is described by Griffiths (1963) and in Bladmineerders van Europa. Mandibles with three teeth (Spencer, 1976: 119).

Puparium: Black or dark red, frequently adhering to the leaf near end of mine; posterior spiracles each with 3 bulbs (Spencer, 1976: 119).

Black or dark brown (Karl, 1926a) (Bladmineerders van Europa).

Comments: Records on Agropyron, Bromus and Holcus given by Hering (1957a) are considered doubtful by Griffiths (Spencer, 1990) and represent other Agromyza species.

Hosts in Britain:

Hosts elsewhere:

Time of year - mines: July-September.

Time of year - adults: Unknown.

Distribution in Great Britain and Ireland: Widespread in Britain including Surrey (Ash Vale), Cambridge (Chippenham Fen) (Spencer, 1972: 39), Warwickshire (Leamington Spa) (Robbins, 1991: 135) and Dunbarton (Bonhill) (Spencer, 1972: 39). Also recorded in the Republic of Ireland: Co. Clare (Spencer, 1972: 39).

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Distribution elsewhere: Widespread in continental Europe including Holland, Germany, Austria, [former] Czechoslovakia, Poland, Russia (Spencer, 1976: 119), The Netherlands (Bladmineerders van Europa), Finland, French mainland, Italian mainland, Lithuania, Slovakia, Spanish mainland and Sweden (Martinez in Fauna Europaea).

Also recorded in Canada (Ontario) (Spencer, 1969a: 47; Spencer, 1990).

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

Parasitoids in Britain and elsewhere: Unknown.