Rubytail

Ru´by`tail`

n.

1.

(Zool.) A European gold wasp (Chrysis ignita) which has the under side of the abdomen bright red, and the other parts deep bluish green with a metallic luster. The larva is parasitic in the nests of other wasps and of bees.

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.