Urbanus proteus is most common along the eastern seabord of the U.S. from Delaware southward, but it is also found in more northern locations including the Midwest (though not as far as Canada). The range extends as far south as Argentina.
In many parts of its range there are look-alike species that make identifications uncertain.
Larvae feed on beans (Fabaceae) and can be pests in the milpa.
Photo location: Great Smoky Mountains National Park, Tennessee.
American Insects site