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Pieris marginalis
My photo is a bit over exposed, and I did not see the underside, but I think you are correct, thanks!
Pieridae, Pierinae, Pieris sp. and most probably Pieris marginalis. Please, verify!
http://www.montereybutterflies.net/Monte...
http://bugguide.net/node/view/12866/bgim...
http://bugguide.net/node/view/208581/bgi...