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 97 (35.9%) of the 270 2km squares of Huntingdonshire.
Last recorded in July 2018
Recorded date range (Adult): 01 May to 25 September
Recorded date range (Larva/Leafmine): 05 July to 19 November