+Petasophora serrirostris+, _Scl. et Salv. Nomencl._ p. 89; _Elliot, Syn. Troch._ p. 52; _Gould, Mon. Troch._ iv. pl. 223. +Petasophora crispa+, _Burm. La-Plata Reise_, ii. p. 447 (Tucuman).
_Description._--Head, upper surface, wing-coverts, flanks, and abdomen dark yellowish green; ear-coverts rich violet-blue; wings purplish brown; tail dark bluish green, crossed near the tip by a broad chalybeate band, beyond which the tips are of a lighter bluish green; throat and upper part of the breast luminous green; across the breast a gorget of shining bluish green; vent and under tail-coverts pure white; bill black; feet blackish brown: whole length 3·8 inches, wings 2·8, tail 1·7. _Female_ similar, but not so bright.
Dr. Burmeister informs us that he met with this Humming-bird in multitudes in the month of September among the orange-blossoms in the Quintas of Tucuman. It is a well-known species in South-east Brazil, but we know of no other record of its occurrence so far south as Tucuman.
+Patagona gigas+, _Scl. et Salv. Nomencl._ p. 89; _White, P. Z. S._ 1882, p. 615 (Catamarca); _Elliot, Syn. Troch._ p. 67; _Gould, Mon. Troch._ iv. pl. 232.
_Description._--Head and upper surface pale brown, glossed with green; wings and tail darker and more green; basal portion of the shafts of the lateral rectrices white; patch on the rump white; upper tail-coverts edged with white; breast mottled brown and buff; throat and abdomen rusty red; under tail-coverts white, with brownish centre spots; bill blackish brown; feet brown: whole length 7·0 inches, wing 4·9, tail 3·4. _Female_ similar but smaller.
_Hab._ Andes of Ecuador, Bolivia, and Peru, Chili, Patagonia, and Northern Argentina.
White seems to be the only observer who has met with this Humming-bird within the limits of the Argentine Republic. He obtained a pair at Andalgala, in Catamarca, in September 1880, and wrote the following notes on the habits of the species:--
"This magnificent bird, which the natives say they have never seen before at Andalgala, was shot on the 'palan-palan,' the usual plant that it frequents at this season. It appeared here just after a two days' severe snow-storm, so that in all probability it had been driven down hither by it.