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 43 (15.9%) of the 270 2km squares of Huntingdonshire.
Last recorded in July 2016
Recorded date range (Adult): 01 June to 14 August
Recorded date range (Larva/Leafmine): 21 August to 17 September