143319 Purple Emperor Apatura iris Wingspan 65mm. An impressive and iconic butterfly of broadleaved woodlands with tall oaks and mature Goat Willows (the larval foodplant). Adult has brown upperwings marked with a white band; the male has the purple sheen, only seen at certain angles. Underwings of both sexes are chestnut with a white band. Flies July-August. Larva is green with diagnostic ‘horns’ at head end. Rare and local, restricted to a few good woodlands in southern England.