Webster’s Revised Unabridged Dictionary · 1913
Rubytail
Ru′by·tail′ (·tāl′), n. (Zoöl.) 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.