A lovely find. In one day in St. Lucia I was able to catch and photograph 11 species of butterflies. A good day when one has to travel so far to find them. They are large 55-60mm and the male and female look very similar except for the brownish area on the bottom centre of the males wings.
Found along the Natal coast and northwards along the eastern boundaries of SA.
Info: Field Guide to Butterflies of South Africa (Steve Woodhall)