PTEROGLOSSUS DERBIANUS 
The Earl of Derby’s Ara9ari. 
Specific Character. 
Tier, rostro castaneo, antice in brimnescenti-nigrum transeunte, ad basin fascia angustd fiavescenti- 
cdbidd cincto: viridis, snpra brmineo parum tinctus ; capite cceridescenti-viridi; remigibus 
nigrescenti-brimneis; rectricum intermediarum duarum apicibus castaneis; orbitcc rufo- 
brimnecB ; tarsi coeruleo-plumbei. 
Bill rich chestnut, passing into deep brownish black on the middle of the upper ami 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 liack of the head and neck, which 
are strongly tinged with blue, the primaries, which are blackish brown, and the tips of the 
two middle tail-feathers, which are chestnut; space round the eyes reddish brown ; tarsi 
blueish lead colour. 
Total length, l4i to 15 inches; bill, 3f; wings, 5 ; tail, 5 j tarsi, H. 
Aulacirhynchus Derbianus. Gould, Proceedings of Zool. Soc,, Part III. p. 49. 
Fob 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 Pteroglossus 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 Pter. 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. 
