Common in fens, marshes, grassland, gardens and damp woodland throughout the British Isles, a species of conservation concern under the UK Biodiversity Action Plan. Widespread and still moderately common in Hampshire and on the Isle of Wight. Wingspan 35-42 mm. The long, thick, black streak from base to centre of wing, white costal streak, and prominent, white, finger-like veins reaching from centre of wing to termen are diagnostic. Larva feeds on various grasses, especially Cock's-foot, over-wintering in a cocoon.