What is this snake? NO PIX sorry cuz it is a dead one.?

i found a dead snake in the road the other day and is still there but i never seen one like it before. it is all silver with a red stripe down the back. i live in northern michigan. also one more snake i found freshly dead (teased my sister with it) it was all green with 2 silverish green stripes on the side of it? so what are these 2 snakes. pictures/source would help.