Pieridae, Coliadinae, Colias sp., I am not sure if a safe ID to species level is possible from only this picture. I slightly would tend to Colias eurytheme, without being that sure. With Colias sp. we are on the safe side.
http://bugguide.net/node/view/847047/bgimage
http://bugguide.net/node/view/861694/bgimage
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