Nationally scarce (Nb) on chalk and limestone grassland, downland, embankments and quarries in southern England, south Wales and east Yorkshire. Fairly widely distributed mainly on downland across Hampshire, and mainly along the south coast in the Isle of Wight. Wingspan 15-21 mm. Unmistakable. Day-flying, sometimes found nectaring by day but most frequently encountered as a visitor to pheromone lure. Larva feeds within roots of Bird's-foot Trefoil and Kidney Vetch.