Convers’ Thorn-tail (Gouldia Conversi), John Gould This species has many characters in common with its Brazilian prototype Gouldia Langsdorffi, but may be distinguished by the smaller size of its body, by its longer wings, by the absence of the scarlet band on the breast, and by the tuft of elongated greenish feathers which spring from the centre of the chest and supply its place as a decoration; the colours of the crown and throat are less brilliant and glittering; and another peculiarity is also observable, namely, that when the tail is closed the lengthened lateral feathers cross each other near the tip, assume an inward curvature, and nearly meet again at the point. 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."