The Collaborative International Dictionary of English v.0.48:

harlequin snake \har"le*quin snake`\ n.
   any of several venomous New World snakes brilliantly banded
   in red and black and either yellow or white, especially the
   eastern coral snake, a small poisonous snake (Micrurus
   fulvius or Elaps fulvius), ringed with red and black,
   found in the Southeastern United States. They are widely
   distributed in Southern and Central America;

   Syn: coral snake, New World coral snake.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Beadsnake \Bead"snake`\, n. (Zool.)
   A small poisonous snake of North America (Elaps fulvius),
   banded with yellow, red, and black.
   [1913 Webster] Beadswoman