Out of place?

Last week, on a hot late summer day, Libby noticed an unusual butterfly feeding on the back yard flowers, so placidly she was able to get me out to photograph it. It was the color of a Luna moth but obviously a butterfly; the raised, leaf- like ribs on its wings had me wondering if it were a "stage" in leaf- mimicry.

White Angled-Sulphur
Anteos clorinde

I asked John Wilson (who knew what it was) to send it in "officially", and received the word that it was the first record in Socorro county and a rare one for this subtropical species in New Mexico.