Brassy Tail (Metallura æneicauda), John Gould The Metallura æneicauda is next in size, and also in rarity, to the Coppery-tailed species, of which latter quality the best evidence consists in the circumstance that neither of these species has received a second specific name. 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."