Rieffer’s Amazili (Amazilia Riefferia), John Gould In a tray now before me I have twenty-five skins of Humming-Birds, all belonging, I believe, to one and the same species, the Amazilia Riefferi. 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."