. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Fig. 35.—Head of Stellula calliope, rf. Fig. 36.—Head of Oalypte anna, J. In all the gorgeted Humming Birds except the genera Atthis and Tilmatura the males have the tail either plain purplish dusky or else varied only with rufous (as in the species of Selasplwrus), the middle pair of feathers, however, usually shining green, like the back. The females all have the tail not only different in form but also totally dif- ferent in coloration;
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Fig. 35.—Head of Stellula calliope, rf. Fig. 36.—Head of Oalypte anna, J. In all the gorgeted Humming Birds except the genera Atthis and Tilmatura the males have the tail either plain purplish dusky or else varied only with rufous (as in the species of Selasplwrus), the middle pair of feathers, however, usually shining green, like the back. The females all have the tail not only different in form but also totally dif- ferent in coloration; the feathers, except the middle pair (sometimes two middle pairs), having a white tip, preceded by a subterminal baud or space of blackish, the basal portion being green or rufous. This type of coloration, however, characterizes both sexes in the genus Atthis, which otherwise appears closely related to the genera Trochilus, Selasphorus, and Calypte. In Tilmatura the tail feathers are strikingly marked with alternate patches of black, white, and rufous. Other genera have instead of the typical humming-bird gorget a beard-like tuft depending from the middle of the throat, and usually very brilliantly metallic in coloration. The extreme forms which this beard-like tuft assume are shown by the accompanying figures. The fantastic markings, towering crests, and lengthened beards of the species of Oxypogon, says Mr. Gould, render these birds very con- spicuous objects notwithstanding their plain coloration. Crests are comparatively uncommon among the Humming Birds, only nine of the more than one hundred genera containing species which are. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Ins
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