I have no idea what kind of snake this is. I have never seen a black one with these greyish-white markings. Since his head is triangular, I assume he is poisonous. He was very aggressive, and slithered toward my van with no apprehension at all. I zoomed the last shot and then cropped it some (so you could see the detail) but he was only 3 feet from my car door when I snapped this - and moving rapidly. As soon as I took the second shot, I raised my window as fast as I could. It will be fine if I never see him or his ilk again!!