At the north of the range, between Santa Fe de Bogota and Quito, at an elevation often of 12,000 feet, is found the sword-bill humming-bird. Its name is derived from the length of its beak, which is nearly as long as its body, and enables it to seek its food from the long pendent corollas of the Brugmansae. Nothing can exceed the elegance of its movements as it probes the pendent blossoms, searching to their inmost depths. Its nest, woven with wonderful skill and beauty of construction, is fastened to the end of a twig. The head and upper part of the body of the male bird are green, glossed with gold in some parts, and with bronze in others. The wings are dark black-brown, with a purple gloss; while the tail is dark black, the upper surface being bronzed. A conspicuous white, slightly elongated spot exists behind each eye, and on each side of the chest there is a broad crescent-shaped mark of light green. The under parts are of a bronzed green, and the under tail-coverts are flaked with a little white. COPPER-BELLIED PUFF-LEG. In the neighbourhood of Santa Fe, another very beautiful and curious little bird, the copper-bellied puff-leg, is found, at an elevation of about 9000 feet. (Unlike the greater number of birds, the female humming-birds are generally as richly ornamented as the male.) It is named from the curious white puffs or ruffs--looking as if formed of swan's-down--on the legs. The head of the male, the sides of the neck, and back, are green, with a bronzed tint, except on the tail-coverts, where the green is pure, and of metallic brilliancy. The tail is black, with a purple gloss; the throat is of a shining, metallic green; while the breast and under portion of the body is green, glossed with gold. This bird, probably on account of the vegetation of the locality, from which it obtains its food, is restricted to a narrow mountain-ridge, not three-quarters of a mile in width. WHITE-BOOTED RACKET-TAIL. The rapid flying white-booted racket-tail is likewise common near Santa Fe. It possesses muffs, like the former, and is found at an elevation of nearly 10,000 feet. It is named from the long, racket-shaped feathers of the tail, which, when flying, are in constant motion, waving softly in the air, opening and closing in the most beautiful manner. In its flight it may vie with the arrow as it darts from a bow; and when the bird rapidly cleaves the air, the tail-feathers lie straight behind it. The chief colour of this bird is a bronzed green, the upper tail-coverts being of a richer and redder hue. The wings are of a purple-brown, as is the tail; but the rackets are black, shot with green. The feet are yellow, with two beautiful white ruffs surrounding the legs. COLUMBIAN THORN-BILL.