Birds. Pl. 47.
Rhea Darwinii.
2. Rhea Darwinii. Gould.
Plate XLVII.
Gould, in Proceedings of Zoological Soc. 1837, p 35.
R. pallide fusca, plumâ singulâ distinctâ semilunari notâ candidâ terminatâ; capite collo, femoribusque pallidioribus: rostri culmine augusti, ad apicem latiore, frontes plumis parvis setosis anticè directis et supra nares extensis; tarsi lateribus in dimidiam partem plumis parvis mollibus tectis; tarso ⅔ anticè posticeque toto, squamis reticulatis tecto.
Long. tot. 52 unc.; alæ, 30; tarsi, 11; rostri, 2.
The whole of the plumage light brown, each feather with a decided crescent-shaped mark of pure white at the extremity; head, neck, and thighs lighter; base of the neck blackish; culmen of the bill narrow, becoming a little broader towards apex; front with small bristly feathers, pointing forwards and reaching over the nostrils. Tarsus with small downy feathers on sides, extending half way downwards; upper two-thirds of front of tarsus, and whole hinder side, with reticulated scales.
Habitat, Eastern Patagonia (Lat. 40° S. to 54° S.)
This species, which Mr. Gould, in briefly characterizing it at a meeting of the Zoological Society, has done me the honour of calling after my name, differs in many respects from the Rhea Americana. It is smaller, and the general tinge of the plumage is a light brown in place of grey; each feather being conspicuously tipped with white. The bill is considerably smaller, and especially less broad at its base; the culmen is less than half as wide, and becomes slightly broader towards the apex, whereas in the R. Americana it becomes slightly narrower; the extremity, however, of both the upper and the lower mandible, is more tumid in the latter, than in the R. Darwinii.
| R. Darwinii. inches | R. Americana, inches | |
|---|---|---|
| Length of beak, from edge of membrane at base to the apex | 2 | 2⁶⁄₈ |
| Length, from anterior margin of eye to apex | 3⁴⁄₁₂ | 5⁶⁄₁₂ |
| Width of upper mandible, measured across middle of nostrils | 1¹⁄₂₀ | 1⁶⁄₂₀ |