Heterodon platyrhynos

from The Collaborative International Dictionary of English v.0.48

Hognosesnake \Hog"nose`snake"\ (Zool.)
   A harmless North American snake of the genus {Heterodon},
   esp. {Heterodon platyrhynos}; -- called also {puffing adder},
   {blowing adder}, and {sand viper}.
   [1913 Webster]