I know of no other specimen than one in Mr. Dubois' collection, and am altogether unacquainted with its locality; although its _habit_ leads me to think it is from South America. * * * * * Pl. 168 [Illustration] RAMPHASTOS ambiguus, _Doubtful Toucan._ * * * * * GENERIC CHARACTER.--See Pl. 45. * * * * * SPECIFIC CHARACTER. _R. niger; jugulo flavo; mandibulae superioris parte superiore flava, transverse maculata, striga viridi oblique divisa; mandibula inferiore nigra._ Black; throat yellow, upper mandible black, the upper half yellow, with an oblique green stripe and transverse spots; the under mandible black. * * * * * The obscurity with which modern ornithologists have described these remarkable birds, would have induced me, long ago, to have attempted a more perfect account of all the species in this work; but as this might have been considered, by some, an infringement on the miscellaneous plan on which it was commenced, I feel obliged to confine myself only to their occasional illustration. The species now selected is one I have never seen; but I have no doubt of its existence, and little of the accuracy of its delineation. I before alluded to several drawings of Toucans which had come to my hands, executed by an unknown artist: among them is a figure of that now published; with a note subjoined, stating it was drawn "from the bird just dead." The other drawings of the same artist represent several of the common species, and their accuracy is presumptive evidence that this also is represented correctly. The singular colouring of the bill at once separates it from all known species; and for its further history, we must trust to the exertions of those travellers, visiting South America, who may feel an interest in illustrating these singular birds. I more than once heard, when in Brazil, of a _Blue Toucan_; but it was said to be very rare, and I never was fortunate enough to meet with one. * * * * * Pl. 169 [Illustration] PTEROGLOSSUS viridis, _Green Aracari,_ (_male_.) * * * * * GENERIC CHARACTER.--See Pl. 44. * * * * * SPECIFIC CHARACTER. _P. nigro virescens; capite juguloque nigris, foeminae castaneis; corpore flavo; rostro serrato, tomiis albis, mandibula superiore aurantiaca, linea longitudinali, laterali, media, nigra, mandibula inferiore caerulea._ Blackish green; head and neck black (in the female chesnut), body yellow; bill toothed, the margins white, upper mandible orange, with a black longitudinal line; lower mandible blue. Ramphastos viridis. _Linn. Gmelin_, 1. _p._ 353. _Lath. Ind. Orn._ 1. 138. _Gen. Zool._ 8. 2. _p._ 370. Green Toucan. _Lath. Syn._ 1. 331.