A Zela Metalmark, Emesis zeal, on Sweet Alyssum flowers. The genus name is the medical term for regurgitation, I'm not sure if these butterflies have a similar emetic effect as shown in Monarchs.
This is lovely..I like the contrast and focus on the butterfly! Wonder what the larvae eat, milkweed is the cause in Monarchs (I believe), so wonder if their larvae eat something equally noxious.