Horntail :: Horntail (n.) Any one of family (Uroceridae) of large hymenopterous insects, allied to the sawflies. The larvae bore in the wood of trees. So called from the long, stout ovipositors of the females..
Thorntail :: Thorntail (n.) A beautiful South American humming bird (Gouldia Popelairii), having the six outer tail feathers long, slender, and pointed. The head is ornamented with a long, pointed crest..