Grey-tailed Humming-bird (Oreopyra cinereicauda), John Gould Mr. Elliot states that this species is closely allied to O. leucaspis, but is distinguished by its ashy white tail; the under tail-coverts are also paler and the bill is longer (culmen 7 8 inch). This illustration has been restored to its original vibrancy by enhancing colors and removing unwanted marks. A monograph of the Trochilidæ, or family of humming-birds was published between 1849 and 1887 by English ornithologist John Gould. This monumental work depicts and describes all the known species of hummingbirds at the time - comprising 418 lithographic plates and information on 537 species."