[23] Male. Length 10¹⁄₄ inches, expanse 6³⁄₈, tail, longest feather 7¹⁄₂, outmost feather 1³⁄₄, flexure 2⁶⁄₁₀, rictus 1, tarsus ²⁄₁₀, middle toe ⁵⁄₂₀. Irides black; beak coral-red, the tip black; feet purplish-brown, soles paler. Crown, hind head, and nape deep velvety black, very slightly glossed; back, rump, wing and tail-coverts, rich golden-green; wings purplish-black, the outer edge of the first primary whitish; second primary longest; tail deep black, with bluish gloss, the uropygials, and the outer edges of the others glossed with golden-green, varying in intensity. The tail is slightly forked, the feathers regularly graduating from the uropygials outwards, save that the outmost but one is exceedingly lengthened. Throat, breast, and belly gorgeous emerald-green, extending to the thighs; vent and under tail-coverts, purpled black. The plumage of the hind head long and loose, descending in two lateral tufts upon the nape, which are to some extent erectile. Female, 4¹⁄₈ inches, tail 1⁶⁄₁₀, flexure 2²⁄₁₀. Irides dark brown; beak dull reddish-brown, black at edges and tip; feet nearly black. Front and crown dusky brown, scaled, gradually becoming green on the hind head, whence the whole upper plumage is rich golden-green. Tail blue black, the exterior two feathers on each side broadly tipped with white: uropygials golden green; the feathers graduate uniformly. Wings as in the male. Under parts white, the feathers having round tips of metallic green on the sides of the neck, and being mingled with green ones on the sides of the body. The plumage on each side of the nape, erectile, as in the male, but somewhat shorter.