Red-billed Azure-crown (Cyanomyia quadricolor), John Gould I believe I am right in stating that this species is exclusively confined to Mexico, as it is from that country alone that I have seen examples. 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."