urosticte

from The Century Dictionary.

• noun A genus of humming-birds, with 2 Ecuadorian species, E. benjamini and E. ruficrissa, of small size, 3½ inches long, the bill ¾ to ⅞ of an inch, the tail emarginate, and the gorget luminous green with or without a violet spot, the general plumage green. They are known as white-tips.