The Collaborative International Dictionary
Rubytail
Rubytail \Ru"by*tail`\, n. (Zo["o]l.) 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.
Wiktionary
rubytail
n. A European wasp, (taxlink Chrysis ignita species noshow=1), with a bright red underside of the abdomen.