Green-bellied Amazili (Amazilia viridigaster), John Gould It will be admitted by every ornithologist that a more appropriate specific appellation than the one applied to this species might easily have been selected—one having reference, for instance, to its greyish-brown back or its nearly pure violet tail, whereas the term viridigaster will apply equally well to at least a hundred species. 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."