The males of this species have antennae three and a half to four times the length of the forewing and are the longest in the British Lepidoptera. The species has a bronzy-purple forewing with a golden yellow fascia edged in purple. It flies at dusk often in groups.

Damp woodland.

Recorded in 49 (18.1%) of the 270 2km squares of Huntingdonshire.

Last recorded in June 2019

Recorded date range (Adult): 16 May to 08 July