Total length twelve inches, of which the bill in extreme length measures three. It is much curved, and more attenuated than any of the Aracaris, being thickest at the base; from which it narrows to a sharp point at the tip. The upper part is convex, and somewhat thickened; the sides are compressed, and the upper mandible has two broad slightly indented grooves on each side: the base has a few transverse wrinkles, and the serratures deep and unequal. The lower mandible half the depth of the upper, the sides concave, and the teeth less. The colour (in the dried bird) black; the base of the lower and the upper half of the superior mandible rufous, the base with a whitish marginal line. The nostrils are more lateral than usual, being placed in a line with the eye; the orbits naked and reddish brown, the feathers encircling which (particularly beneath the eye) are vivid cerulean blue. The whole upper plumage is parrot green, paler beneath, with a gloss of golden yellow on the cheeks and sides: throat dusky white. Wings short, five inches long, and rounded; inner shafts of the quills black, margined with whiteish. Tail cuneated, green, four inches and a half long, the four middle feathers equal. Legs dusky black. * * * * * Pl. 45 [Illustration] RAMPHASTOS carinatus, _Sharp-billed Toucan._ * * * * * GENERIC CHARACTER. _Rostrum capite longius, maximum, crassum, inane, cultratum, basali margine incrassatum; maxillae angulo frontali subtruncato transverso: Nares verticales, pone maxillae basin sitae; tomia serrata; lingua angusta, pennacea; cauda brevis, aequalis; pedes scansorii._ Illiger. Prod, p. 212. Typus Genericus _R. erythrorynchus_ Lath. Bill very large, longer than the head, thick, light, curved, and thickened at the basal margin; the frontal angle transversely sub-truncated, margins serrated. Nostrils vertical, behind the base of the bill. Tongue slender, long, and feathered. Tail short, even. Feet scansorial. Generic Type _Red-billed Toucan_ Lath. * * * * * SPECIFIC CHARACTER. _R. niger; gula flava; fascia pectorale tegminibusque inferioribus rubris; rostro viridi, apice rubro; mandibula superiore culmine carinato flavo, lateribus macula aurantia; inferiore caeruleo variegata._ Black; throat yellow; pectoral bar and under tail covers red; bill green, tip red; upper mandible carinated and yellow above, the sides with an orange spot; lower mandible varied with blue. Yellow-breasted Toucan. _Edwards, pl._ 329. Ramphastos Tucanus. Yellow-breasted Toucan. _Gen. Zool._ 8, 362, (_excluding the Synonyms._) * * * * *