This
is the dry season form of the butterfly, which I saw (just once) in the
zoological gardens in Ooty. It rather resembles a green-veined white.
I found the better-marked wet season form in October in Tirupur:
Fred also found this form when he visited in October 2010:
In the next pictures it is
joined by an Indian skipper,
Spialia
galba, which appears to be mobbing it!