This species cannot be readily distinguished as an adult from the Dark Dagger, A. tridens, 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 98 (36.3%) of the 270 2km squares of Huntingdonshire.
Last recorded in April 2022
Recorded date range (Adult): 30 April to 25 September
Recorded date range (Larva/Leafmine): 30 June to 19 November