Polyura arja, the pallid nawab, is a butterfly belonging to the rajahs and nawabs group, that is, the Charaxinae subfamily of the brush-footed butterflies family.
Polyura arja has a wingspan of 75-. The outer edge of the forewings is concave and the hindwings show two short blue tails. The upperside of the wings is brown with a broad white or anteriorly pale green band from the inner edge of the forewing to the costal edge of the hindwings, one or two small white spots at the apex of the forewings and a continuous row of white or pale yellow spots running along the outer submargin of the hindwings. The underside of the wings is lighter brown with a quite similar pattern. The body is dark brown.[2]
This species can be found in north-east India (Sikkim to Assam), Burma, Thailand and Indochina.[3]
. W.H. . William Harry Evans . The Identification of Indian Butterflies . 2nd . Mumbai, India . . 1932 .