My specimens were procured on the northern bank of the Plata. It is more common there than the foregoing species, to which it is most closely allied: its chief distinguishing character appears to be the greater shortness of its toes and of the hind claw. I have seen this species alight on twigs. In the breeding season it flies upward, and then falls to the ground, with raised wings, in the peculiar manner common to the _Anthus arboreus_ of England. It builds on the ground; nest simple; egg ¹⁰⁄₁₂ of an inch in length, and ⁷⁄₁₂ in width; colour dirty white, with small specks and blotches of dull red and obscurer ones of purple. This species, both in habits and structure, appears to be an analogue of _A. arboreus_ of the northern hemisphere, as _A. correndera_ is of _A. pratensis_. Mr. Yarrell informs me that the egg of _Anthus furcatus_ is very different from that of _A. arboreus_, although the parent birds are so similar. 3. ANTHUS CHII. _Licht._ A. Chii, _Licht. Spix_, Av. Sp. No. i. t. lxxvi. fig. 2. p. 75. Le Chii, _Azara_, No. 146. My specimen was procured at Rio de Janeiro, in Brazil. SYLVICOLA AUREOLA. _Gould._ PLATE XXVIII. _S. supra flavescenti olivacea; fronte cerviceque nitide flavis, singulis plumis ad apicem rufescenti castaneis; occipite griseo; alis caudâque nigrescentibus, latè flavo-marginatis; genis guttureque nitidè flavis; pectore concolori sed singulis plumis in medio pallidè castaneo notatis; abdomine albescenti._ Long. tot. 5 unc.; _rostri_, ⁸⁄₁₂; _alæ_, 2⁶⁄₁₂; _caudæ_, 2³⁄₁₂; _tarsi_, ¹⁰⁄₁₂. The nape of the neck, back and tail-coverts yellowish olive; the wings and tail blackish, broadly margined with yellow; the front and crown yellow, with the tips of the feathers reddish castaneous; the hind head grey mixed with yellow, the cheeks and the throat bright yellow; the breast of the same colour, but each feather is marked down the middle with pale reddish castaneous, the sides and middle of the abdomen whitish. Habitat, Galapagos Archipelago. (_September_). This bird is not uncommon on these islands. It has the habits of our Sylviæ. It frequents the thickets in the lower, dry and rocky parts of the island, and especially a peculiar bush, with thick foliage, which grows only near the sea-coast. CYANOTIS OMNICOLOR. _Swains._ Regulus omnicolor, _Vieill._ Gal. pl. 166. Sylvia rubrigastra, _Vieill._ Regulus Byronensis, _Gray_, Griff. An. King. pl. Tachuris omnicolor, _D’Orb. & Lafr._ Tachuris roi, _Azara_, No. 161.