Thanks Dave. I've since learned that this insect is a "Common Wood Nymph Butterfly - Cercyonis pegala". I've also seen photos of it on the web where the light spot on the wing is yellow. My photo shows it a beige color and that's what I saw so the photo is correct. I'm wondering if they, like many birds, have a time in their lives where "breeding plumage" is apparent. The American goldfinch, as an example, is bright yellow from May through July and turns a drab variation the rest of the year. They do not migrate in my area but most people don't realize that and mistake the goldfinch for a sparrow species not realizing the birds are the same and simply a color change has occurred.