Description.—Crown of head luminous metallic green, changing in some lights to aquamarine, in others to bluish green, and in others to golden green; all the upper surface and wing-coverts golden green, the golden hue predominating on the lower part of the back; wings purplish brown; tail purplish black, glossed with dark green; behind the eye a spot of white, and on the cheeks a streak of grey; centre of throat rich metallic purplish crimson, on each side of which is a series of elongated feathers of a rich deep metallic blue; under surface deep green, passing into rich blue on the middle of the body; tuft on each side and vent white; under tail-coverts green, fringed with white; bill black; feet blackish brown: whole length 5·2 inches, wing 2·3, tail 1·7. Female: the whole of the upper surface golden bronze, inclining to grey on the crown; tail green, deepening into black towards the extremity, and a spot of white at the tip of the three outer feathers of each side; wings purplish brown; under surface grey, fading into white on the throat and middle of belly.
Hab. S. Brazil, Paraguay, and Argentina.
Of the three Humming-birds which visit the vicinity of Buenos Ayres in the summer months, Mr. Durnford tells us this is the rarest. It is occasionally seen in the riverain wood, and like the other two (Hylocharis sapphirina and Chlorostilbon splendidus) may generally be found hovering over the flowers of the Ceiba-tree—a species of Erythrina.
Further to the north this species would seem to be more abundant. Dr. Burmeister met with it near Tucuman and Paraná, and at one time described the young birds obtained in the latter locality as of a distinct species (Campylopterus inornatus), an error which he subsequently corrected (cf. P. Z. S. 1864, p. 466). White procured it in the city of Catamarca in August 1880.
Mr. Barrows has published the following interesting account of his observations on this species in Entrerios (Auk, 1882, p. 21):—
“Early in September, at Concepcion, when the orange-trees are just whitening with blossoms, these magnificent Humming-birds arrive from the north, and may occasionally be seen about the orange-trees in any garden, as well as about blossoming trees elsewhere. The males seemed for some reason to be much less abundant than the females, hardly more than a dozen being seen in an entire season. They probably nest in November and December, and leave for the north again in February or March. A nearly finished nest, found November 17, was very similar to that of our own Ruby-throat (Trochilus colubris) but larger, and was built in the compound fork of a large limb at a height of over 25 feet from the ground. It was deserted soon after, perhaps as a result of my examination. Ten days later another nest was found saddled on the topmost horizontal limb of a dead and moss-grown stub; only about seven feet from the ground, and exposed to the full force of the sun. This nest contained two eggs nearly ready to hatch. Both nests were beautifully covered with lichens, and the last was lined with the finest of vegetable down. The female made several angry rushes at me before the nest was touched, but as soon as she saw that it was discovered became so shy that it was difficult to secure her. The male was not seen at all. I once saw a bird of this species attack and put to rout a wild dove which passed near it while feeding, and though the dove made every effort to escape, the Hummer not only kept up with it easily, but darted above and below it as well, and finally both went out of sight in the distance together.”
[236.] LEUCIPPUS CHIONOGASTER (Tsch.).
(WHITE-BREASTED HUMMING-BIRD.)
Leucippus chionogaster, Scl. et Salv. Nomencl. p. 91; White, P. Z. S. 1882, p. 616 (Catamarca); Elliot, Syn. Troch. p. 199; Gould, Mon. Troch. v. pl. 290.
Description.—Head, upper surface, wing-coverts, and flanks bronzy green; throat and whole lower surface white; wings purplish brown; central tail-feathers bronzy green, lateral dull bronzy brown on the outer webs; inner webs and shafts white, the inner webs clouded with bronzy brown in the centre; bill black, lower mandible paler at the base: whole length 4·2 inches, wing 2·1, tail 1·3. Female similar.