Local in ancient broad-leaved woodland and on limestone pavements throughout much of the British Isles. In Hampshire and on the Isle of Wight widely distributed but somewhat scarce, in surviving areas of mature deciduous woodland. Wingspan 32-38 mm. Fairly unmistakable. Larva feeds on Hazel, Downy Birch, Silver Birch, Sallow and Hawthorn, over-wintering as a pupa.