Hello Geoffrey! This is a very pretty little butterfly you have here.
It looks very close to a Pear Crescent, Phyciodes tharos: http://bugguide.net/node/view/411
I feel that this is most likely the Pearl Crescent but you might want to look at a couple of other butterflies in the same genus since some of them look quite similar:
http://bugguide.net/node/view/221/bgpage
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