Blue-throated Sapphironia (Sapphironia cæruleigularis), John Gould I have not placed the Trochelus Duchassaigni and Thalurania Cœlina of M. Bourcier among the synonyms of the present species without due consideration and a careful comparison of the typical specimens one with the other. 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."