I cannot find a photo of him on-line in the "Caterpillars of Eastern Forests" site, and don't know of a field guide by color, and the lighting's in a bad spot for me to get a photo. Lacking any notion of the family, wading through dozens of moth guides sounds a little alarming. Anybody have any notions?
Update: And thanks to trishtrash below, we have identification! He is that nefarious pest, the orange-striped oakworm!
I'm supposed to squish him to save the trees, but that would involve getting caterpillar gunk all over things. Erk.