the one i posted was Dipsas catesbyi, which is a snake in s america that eats snails in particular apparently, but were doing the other one so concentrate on that
Okay, found it here http://southeast.fws.gov/news/2004/r04-019.html
The Louisiana Pine Snake (Pituophis melanoleucus ruthveni). Did some tromping aeround where it is from and never saw one, I have seen the Northern but it has a different pattern.