A distinctly marked moth with a whitish forewing with dark brown markings. Easily confused with Swallow Prominent (Pheosia tremula), which lacks the white wedge-shaped tornal streak. Wingspan 48mm.
The caterpillars feed on birch.
The adults fly in two generations, late April to June, and July to August. Attracted to light. Found in woodland, heathland, moorland, downland, parks and gardens. Resident, common and widespread throughout the British Isles.
June 2013, rear garden, Staffordshire. © Pete Hillman 2013.