This is a Mustard White butterfly. They have been flitting about the yard and woods edge for a week now. They only show up in the northern tier states. It was identified for me at bugguide.net by Cliff Bernzweig. The wonderful part of photographing birds and insects is that you never forget what they are once you learn. When clicked, these photos will open, full size, in a new window.
Technorati Tags: Pieris oleracea, Mustard White butterfly