Local in damp woodland, marshes and fens throughout much of England and Wales. In Hampshire and on the Isle of Wight scattered through the three vice-counties, mainly along the river valleys. Wingspan 32-42 mm. Characterised by the pale, sinuous subterminal line, often edged basally by two or more moderately distinct, dark wedge-shaped spots (MBGBI Vol 10). Larva feeds on catkins and leaves of Eared Willow, Grey Willow, Goat Willow, Sallow, Black Poplar and White Poplar, over-wintering as an egg.