It is with hesitation that I place this species in the genus Certhiola. The extreme slenderness of the beak, its curved form, and acute tip, the form of the wings, the length of the tarsi, and above all, _the pencil of hairs_ which forms the termination of the tongue, have guided me in this decision. It appears to be so rare in the United States, that but a single specimen occurred to the indefatigable Wilson, and but one to the Prince of Canino. I found it rather less scarce in Jamaica, having obtained some four or five specimens in the course of the autumn and winter. The character of its plumage is certainly that of the Warblers, as is its seasonal change: of its manners I regret that I have no notes. When it arrives with us in October, the crown of the male, instead of being deep black, is ashy-grey, tinged here and there with yellow, and studded with black spots, the feathers having black disks with ashy borders. In February, by the growth of the feathers, and the wearing off of the edges, the black spots have become confluent, forming an unbroken black surface, which is its summer character. The fat of this species is of a deep fulvous hue, almost orange. +Fam.+—TROCHILIDÆ. (_The Humming-birds._) MANGO HUMMING-BIRD.[22] _Lampornis Mango._ _Trochilus mango_, +Linn.+ _Lampornis mango_, +Swains.+ [22] Length 5 inches to 5¹⁄₄, expanse 7¹⁄₈, tail 1³⁄₄, rictus 1²⁄₁₀, flexure 2⁹⁄₁₀, tarsus ¹⁄₄, middle toe ⁷⁄₂₀. Irides, dark hazel; beak and feet black. For what reason Linnæus applied the trivial name of Mango to this Humming-bird I have no knowledge; that it could have no connexion with the mango tree is evident, since that tree was not introduced into the western world till long after his time. It was perhaps a native name. It is not confined to Jamaica, but seems more widely spread than most of these tiny birds. Lesson says, “The Mango inhabits Jamaica, and, as it appears, not only the greater Antilles, but also Terra Firma, and even, it is said, Brazil and Guiana.” Hence it has long been familiar to naturalists. It is the Largest or Blackest Humming-bird of Sloane. Lesson, in “Les Colibris,” has given no less than four figures of this species in different ages, pl. xiii. to xv., but I cannot say much in their praise.