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Show 804 MR. J. GOULD ON TWO SPECIES OF HUMMING-BIRDS. [Dec. 6, Buckley in having collected so many species during the very short time he had been in the country, and gave the following descriptions of the two new species :- CHAETOCERCUS BOMBUS, sp. nov. This species must be classed with the most diminutive of the Trochilidae. In its general appearance aud in its coloration it strongly reminds one of Chaetocercus rosce, while, in some parts of its structure, particularly in the form of its two hair-like outer tail-feathers, it resembles Acestrura mulsanti; its wing is even smaller and shorter than that of the little A. heliodori. It must, however, be placed, as I believe it is correctly, in the genus Cheetocercus. The following is a more minute description and admeasurement of this little bird. Male. Crown of tbe head, upper surface, and abdomen bronzy green ; throat brilliant crimson-red, nearly surrounded by a mark of buff, forming a conspicuous band across the chest, a feature distinguishing it from Cheetocercus rosce, in which the band occupying the same space is white; wings purplish black; the tail-feathers the same, with the exception of the third or longest on each side, on which there is a very narrow edging of buff near the base of the inner margin; the two outer tail-feathers very fine and hair-like; the four central ones extremely small, so much so as to be hidden beneath the tail-coverts ; bill and legs black. Total length 2\ inches ; bill T 9 F, wing i|, longest tail-feathers f, tarsi g. Female. Larger than the male. Crown and upper surface green ; throat and under surface chestnut-brown ; tail, which is extremely short and even, deep chestnut-brown, banded with black across the centre of each feather. Totallength 2k inches; bill -f, wing 1^, tail \, tarsi \. Hab. Citado in Ecuador. THALURANIA HYPOCHLORA, sp. nov. The nearest ally to this new species is Thalurania verticeps; but from this it differs in having the entire under surface green instead of having a blue abdomen. Male. Frontal three-fourths of the crown of a beautiful green, which also pervades the entire under surface of the body ; all tbe upper surface deep grass-green, with a lovely patch of blue on the shoulder, extending for a short distance on to each side of the breast; under tail-coverts blackish blue, edged with white; bill black ; feet brownish black. Total length 4 inches ; bill -|-, wing 2g, tail 1|. Female. All the upper surface grass-green; throat, abdomen, and under tail-coverts grey, darker and inclining to green on tbe flanks; tail purplish black, slightly tipped with white, the white tipping being of lesser extent on the central than on the outer feathers. Size rather less than that of the male. Hab. Citado in Ecuador. |
