Most unusual for the butterfly to have its wings open I'm sure its a Pale Clouded Yellow but as you say it shows a remarkable similarity to a female Eastern Pale C. Y.
You have me going now here is a picture of a pale Yellow White variant (they make up 10% of females) you can see through the wings to the upper pattern its close to yours but white
Ce que nous connaissons est peu de chose, ce que nous ignorons est immense
Pierre Simon Laplace 1749-1827
Last edited by basquesteve; 09-11-2010 at 01:47 PM.
Reason: Got thinking