Got it. Darn it I thought that would last longerThat is interesting! I'm going to say it's the darkest Drymarchon corais erebennus I've ever seen.
i have actually remember reading about it a while ago i'll see if i can look up and article on it.
here it is: the snake i was thinking of is Rhabdophis tigris, not the snake you posted but still interesting. the article is here, (at least one of them)