Bucephalus Capensis

from The Collaborative International Dictionary of English v.0.48

Boomslange \Boom"slang*e\, n. [D. boom tree + slang snake.]
   (Zool.)
   A large South African tree snake ({Bucephalus Capensis}).
   Although considered venomous by natives, it has no poison
   fangs.
   [1913 Webster]