Local on heathland, downland, waste ground and cliff-tops throughout much of southern England and East Anglia. In Hampshire and on the Isle of Wight an immigrant which has become established; since 1990, singletons have been seen regularly, and breeding colonies are established, perhaps temporarily, in several localities on the coast and across the chalk downland. Wingspan 29-34 mm. Fairly unmistakable: pale sulphur-yellow when fresh, fading whiter with age, but always with prominent veins. Larva feeds on flowers and seeds of Fennel, Wild Carrot, Pepper-saxifrage, Hogweed and other umbellifers.