Jourdan’s Wood-star (Calothorax Jourdani), John Gould If the Calothorax Jourdani and C. Rosæ are not one and the same species, they are certainly most nearly allied, the principal, if not the only difference between them being a slight variation in the colouring of their throat-marks, which in the latter is crimson, and in the former deep lilac or puce; in size and form, and in the colouring of their tails, the two birds are precisely similar. 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."