Looks like a racer, had one come up to me last year while me and some friends were field Herping in an old field.
A picture taken in natural light helps, for example this was taken with a cell phone during low sun...
Be sure to check your local and state laws regarding field collected animals, it may be illegal in some areas or just for some species. Also, wildcaught snakes often have quite a few parasites that can be harmful in captivity, so if things turn out to be legal, just take the little guy to the vet for a fecal exam and treatment.