Violet-Tail (Metallura smaragdinicollis), John Gould At a first glance this species has a close resemblance to the M. tyrianthina; but on a further examination it is found to be more beautiful, and it certainly is very much more rare in the collections of Europe; the two species are in fact representatives of each other on either side of the equator, the present bird being found solely in Peru and Bolivia, while the M. tyrianthina is as exclusively an inhabitant of the high ranges north of the line. 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."