+Embernagra platensis+, _Burm. La-Plata Reise_, ii. p. 485 (Paraná); _Scl. et Salv. P. Z. S._ 1868, p. 140 (Buenos Ayres), 1872, p. 548 (Rio Negro), _iid. Nomencl._ p. 32; _Durnford, Ibis_, 1877, p. 172 (Buenos Ayres); _White, P. Z. S._ 1882, p. 600 (Buenos Ayres, Corrientes); _Döring, Exp. al Rio Negro, Zool._ p. 40 (R. Colorado, R. Negro); _Barrows, Bull. Nutt. Orn. Cl._ viii. p. 132 (Concepcion, Entrerios). _Description._--Above dull olive-green, striped with blackish; wings silky olive-green, the inner webs of the feathers black; edge of wings yellow; tail-feathers dull olive-green; beneath, throat and breast grey; belly buff; beak bright red; feet pinkish horn-colour: total length 8·8 inches, wing 3·7, tail 3·8. _Female_ similar. _Hab._ South Brazil, Paraguay, and Argentina. In this Finch the plumage is alike in both sexes. Above it is dusky olive-green, beneath grey; the beak is of a fine bright red. In Argentina this bird is most common in the littoral forests along the Plata, but ranges as far south as the Rio Negro in Patagonia. It does not migrate, nor associates in flocks; but the sexes are faithful, and the male and female are invariably together, and appear to be very fond of each other's society. They have a loud, sharp alarm chirp or cry, which bursts from the bird with the startling suddenness of a sneeze from a human being; also a confused unmelodious song, which always reminds me, in its hurry, vehemence, and peculiar sound, of the gobbling of a turkey-cock. They are not shy, but when approached sit jerking their tails about, and uttering loud chirps as if greatly excited. The flight is very curious; the bird springs up with great suddenness, and with tail erect, and the long legs dangling down like a Rail's, proceeds by a series of irregular jerks, violently shutting and opening its wings. They breed on the ground under the grass, and conceal their nest so well that I doubt whether the parasitical _Molothrus_ ever finds it. I have, at all events, never seen them followed by the young of _Molothrus_ demanding food.