Race castetsi, Oberthur: The females of this remarkable form seem to be locally dimorphic.
Male closely resembles the male of hyperbius but differs as follows: Upperside: ground colour a richer brighter shade of orange yellow; black markings similar but distinctly smaller, of a deeper black: subterminal transverse series of slender lunules traversing the terminal black margin on the hindwing of the same shade of orange yellow as the ground colour, not blue on the posterior half of the wing.