The Tufted-Neck Humming Bird described by Buffon under the name of _l’Oiseau-Mouche de Cayenne_, _Le Hupecol de Cayenne_, differs in no respect that we perceive from the bird before us; and for this reason we can have no hesitation in considering it as an individual of the same species. Our specimen is not from Cayenne, it was brought from New Zealand, and was one among the number of those rarieties collected in that island by the celebrated Navigator Captain Cook, in his first voyage round the world: that in which he was accompanied by Sir Joseph Banks, and Dr. Solander. The New Zealand specimen, though it nearly accords with the bird described by Buffon under the name of Hupecol de Cayenne, does not entirely agree with the description given of that species by Dr. Latham: it differs in wanting the white band on the rump, and the patch or space of the same colour on the lower region of the belly. Buffon speaks of such a characteristic mark of white on the rump, but not the abdomen of the Cayenne kind.[17] And it is not unlikely that these appearances may be indications only of a change in plumage, as the same circumstance is not unfrequently observed in many other birds at particular seasons, or in certain states of moulting. Dr. Latham himself observes that in the female these marks, instead of being white, incline to rufous, and this, no doubt, in the adult bird. There is certainly no appearance of white either upon the rump or region of the belly in the bird before us; and this example bears every appearance of having arrived at its full maturity of plumage. Perhaps the bird from Cayenne having a white band on the rump and abdomen, may be, however, if not a distinct variety, the more mature bird of the same species as that met with by our circumnavigators at New Zealand.