dart snake

from The Collaborative International Dictionary of English v.0.48

Acontias \A*con"ti*as\, n. [NL., from Gr. ?, fr. ?, dim. ?
   dart.] (Zool.)
   Anciently, a snake, called {dart snake}; now, one of a genus
   of reptiles closely allied to the lizards.
   [1913 Webster]