The outer edge of the forewings is concave and the hindwings show two short blue tails.

[3] Seitz -E. arja is an exclusively continental species of pronounced seasonal dimorphism, distinguished from E. athamas by the peculiar pale greenish white discal blotches on the upper surface.

Underneath the black submarginal striae are surrounded by a broader, pale greyish-white shade.

(134 a) refers to the extreme dry-season form, in which the pale colouring prevails, whereas roeberi Fruhst.

[4] This species can be found in north-east India (Sikkim to Assam), Burma, Thailand and Indochina.