The Swallow Prominent's natural colouring above. Wingspan 45-55mm; UK flight time May-Aug.
It looks a bit yellower under artificial light (different individual).
Similar to its relative, the Swallow Prominent, but it can be identified by the wider white wedge-shaped triangle on the top edge of its forewing (nearest to body when wings are closed).
Usual resting position of both Swallow Prominents from the side
Not much smaller than its relative at a wingspan 45-50mm. UK flight time May-Jun; Aug-Sep.