Taczanowski’s Emerald (Agyrtria taczanowskii), John Gould This species was described by Dr. Sclater from a specimen procured by Stolzmann at Guajango, in Peru. 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."