Adelpha bredowii, commonly known as Bredow's Sister, is a species of butterfly in the family Nymphalidae. It is endemic to western, central, and southern Mexico. This is a ventral view of the subspecies California Sister (Adelpha bedowii californica).
it looks as though it's dressed up for cocktails on "Mad Men." It's a Convict Moth, and you'll see more equally beautiful moths and caterpillars in the book "Owlet Caterpillars of Eastern North America," published by Princeton University Press.