Green-fronted Lance-Bill (Doryfera Ludoviciæ), John Gould Naturalists often assume the privilege of honouring individuals by naming remarkable species after them, and although this practice is by no means to be commended, it is one which may readily be excused when exercised in favour of those whose names are favourably known in the annals of science; in the present instance it has been employed with singular appropriateness to do honour, through his wife, to M. Isidore Geoffroy Saint-Hilaire, whose fame as a scientific naturalist is familiar to every one. 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."