Black-billed Azure-crown (Cyanomyia cyanocephala), John Gould So great is the confusion which exists respecting the synonymy and species of this form, that I might be held excused were I to give new specific appellations to at least two of them, namely the one here represented, and the one I have figured as Cyanomyia quadricolor; the case is very different with the C. Franciæ of M. Bourcier and the C. cyanicollis of myself, as the types of both of these are in existence and well known. 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."