Chilabothrus argentum
"The entire silver boa population, which the team estimates to be fewer than a thousand animals, is found only in one small patch of Earth."
The good news is the island where they are found is a national parkland with very few human visiters.
For more info on this beautiful silver snake read this article on the National Geographic website. http://news.nationalgeographic.com/2016/05/snakes-animals-science-new-species-conservation/