This species cannot be readily distinguished as an adult from Grey Dagger except by examination of the genitalia. The larvae are, however, quite different.
Pupates in a crevice in tree bark.
Woodland, fens and gardens.
Recorded in 47 (17.4%) of the 270 2km squares of Huntingdonshire.
Last recorded in June 2019
Recorded date range (Adult): 24 May to 14 August
Recorded date range (Larva/Leafmine): 01 August to 17 September