Green-tailed Humming-bird (Chrysobronchus viridicaudus), John Gould As is the case with the foregoing species, Chrysobronchus virescens, much confusion has hitherto existed with regard to the correct specific name of this species, and it is the unravelling of the synonymy of such species as these which is the great plague of the Monographist. 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."