PTEROGLOSSUS DERBIANUS., The Earl of Derby’s Aragari. SPECIFIC CHARACTER. a. a : ; Pter. rostro castaneo, antice in brunnescenti-nigrum transeunte, ad basin fascia angusta, flavescenti- “7A . sae \ : C c ye 5 albida cincto : viridis, supra brunneo parum tinctus ; capite cerulescenti-viridi ; remigibus gibus nigrescenti-brunnets ; rectricum intermediarum duarum apictbus castaneis; orhite rufo- brunnee ; tarsi ceruleo-plumber. Bill rich chestnut, passing into deep brownish black on the middle of the upper and the anterior portion of the lower mandibles, the sides of the base of both having a narrow band of yellowish white ; the upper surface of the body green, with a slight tinge of brown; all the remaining plumage green, with the exception of the back of the head and neck, which are strongly tinged with blue, the primaries, which are blackish brown, and the lips of the two middle tail-feathers, which are chestnut : space round the eyes reddish brown ; tarsi blueish lead colour. Total length, 142 to 15 inches ; bill, 32; wings, 5; tail, 5; tarsi, 14. 5 Aulacirhynchus Derbianus. Gould, Proceedings of Zool. Soc., Part ITI. p. 49. For the loan of the only example of this fine species which has come under my notice I am indebted to the kindness of the Earl of Derby, whose valuable collection has so often afforded me the opportunity of examining rare and new species. In naming this new bird after so distinguished and honourable an individual, I am influenced partly by the interest which His Lordship takes in the promulgation of science, especially orni- thology, and partly by the desire I feel to testify my respect and gratitude. As far as I have been able to ascertain, this species is an inhabitant of the Cordillerian Andes, from which country it came, although by an indirect channel, into the possession of Lord Derby, who kindly forwarded it to me for the purpose of its being figured and described. It differs from Preroglossus sulcatus (the only known species with which it is likely to be confounded) in being more robust in size, and in having a more powerful and less attenuated bill, the basal angle of which is not carried near so far back as in Péer. sulcatus: the brown tips of the middle tail-feathers of the present species, a character never seen in P. sulcatus, will also serve at all times to distinguish them. A Yoallhe.