Overwinters as a pupa and adults come regularly to light.
Note Can be confused with Swallow Prominent. In this species the pale white wedge is smaller and more distinct and extends from the trailing corner of the forewing a third or less of the way to the wing base.
Recorded in 116 (83%) of 140 10k Squares. First Recorded in 1867. Last Recorded in 2019. (Data up to end 2019) Additional Stats