Bolivian Violet-Ear (Petasophora iolata), John Gould Although the colouring of this species is precisely similar to that of P. Anais, I have always regarded it as distinct, and in confirmation of this view, I may state that it is of much larger size, that it has a longer and more curved form of bill, and that it moreover inhabits a different country. 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."