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18.116.19.29
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From: Webster's Revised Unabridged Dictionary (1913)

 Ru·by·tail n. 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.
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