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Pieridae, Belenois aurota. Completely wrinkled and worn guy! I am absolutely not sure. Most of the markings are no more visible.
Just a few to compare:
http://www.flickr.com/photos/kingseye198...
http://en.wikipedia.org/wiki/File:Pionee...
http://www.flickr.com/photos/kingseye198...
http://www.flickr.com/photos/silphotogra...