_Description._--Head, all the upper surface, and wing-coverts rich golden bronze, but inclining to green on the upper tail-coverts, wings purplish brown; tail black, glossed with deep green; throat and breast glittering emerald-green, merging into glittering coppery bronze on the sides of the neck and abdomen; under tail-coverts green; bill fleshy red at the base, with a darker tip; feet blackish: whole length 3·5 inches, wing 2·2, tail 1·3. _Female_ bronzy green above and grey beneath, washed with bronze on the flanks; wings purplish brown; tail bluish black, the two lateral feathers tipped with greyish white. _Hab._ South Brazil, Paraguay, and Argentina. The Glittering Humming-bird appears in the vicinity of Buenos Ayres in September, and later in the spring is found everywhere on the pampas where there are plantations, but it is never seen on the treeless plains. Its sudden appearance in considerable numbers in plantations on the pampas, where there are flowers to which it is partial, like those of the acacia-tree, and its just as sudden departure when the flowers have fallen, have led me to conclude that its migration extends much further south, probably into mid-Patagonia. Like most Humming-birds it is an exquisitely beautiful little creature, in its glittering green mantle; and in its aerial life and swift motions a miracle of energy. To those who have seen the Humming-bird in a state of nature all descriptions of its appearance and movements must seem idle. In the life-habits of the Trochilidæ there is a singular monotony; and the Glittering Humming-bird differs little in its customs from other species that have been described. It is extremely pugnacious; the males meet to fight in the air, and rapidly ascend, revolving round each other, until when at a considerable height they suddenly separate and dart off in opposite directions. Occasionally two or three are seen flashing by, pursuing each other, with such velocity that even the Swift's flight, which is said to cover four hundred miles an hour, seems slow in comparison. This species also possesses the habit of darting towards a person and hovering bee-like for some time close to his face. It also flies frequently into a house, at window or door, but does not, like birds of other kinds, become confused on such occasions, and is much too lively to allow its retreat to be cut off. It feeds a great deal on minute spiders, and is fond of exploring the surfaces of mud and brick walls, where it is seen deftly inserting its slender crimson bill into the small spider-holes in search of prey. The nest, like that of most humming-birds, is a small, beautifully-made structure, composed of a variety of materials held closely together with spiders' webs, and is placed on a branch, or in a fork, or else suspended from slender dropping vines or twigs. Sometimes the nest is suspended to the thatch