This species is similar to the Lesser Swallow Prominent but has a less distinct white wedge at the tornus of the forewing.
The Swallow Prominent also has a wavy pale line in the dark area of the hindwing.
Pupates in loose soil.
Woodland, poplar plantations, parks and gardens.
Recorded in 110 (40.7%) of the 270 2km squares of Huntingdonshire.
Last recorded in August 2020
Recorded date range (Adult): 02 April to 11 September
Recorded date range (Larva/Leafmine): 13 August to 17 September