Mite sprays can be VERY VERY toxic. It is best to read the label many times and ask people about it before using it, just to errr on the side of caution for this type of thing not to happen. I have to agree with Pat on this one... WTH were you thinking? Poor poor snake.
Also if you have any other snakes FOR THE LOVE OF GOD DO NOT AND I REPEAT DO NOT touch those snakes with that mite killer till you tell us just what kind/brand it is and if you have sprayed there enclosures/them with it then I'd be on my way with them to a er herp vet!