ADDENDA TO THE INTRODUCTION. 
In my Preface to the present Monograph I intimated that I was aware tiiat two or three 
additional species had been described by the late Professor Wagler in his ‘ Systema Aviuni 
which might perhaps prove to be distinct from those figured by myself. Not having seen 
any examples of the birds themselves, and being consequently unable to determine witli 
certainty as to their complete distinctness, I could not then include them in my work. I have 
since had an opportunity of personally examining them, during a recent visit to the Museum 
of Munich, in which they are deposited ; and I now liasten to lay before the scientific public 
the results of my investigation, and to complete my account of all the species known up to 
the present time. The fine collection of Vienna aflbrded me examples of three new species, 
which, with one kindly forwarded by the Earl of Derby, another by N. C. Strickland, Esq., 
and a third by W. Swainson, Esq., make an intere.sting addition of ten species,—two Toucans 
and eight Ara 9 aris,—of which the following is an eiunneration. 
The Toucans, although possessing nearly all the essential characters of the first section, A, of 
the genus Ramphastos, differ in some respects from other species referred to it. One of them 
has the upper tail-coverts remarkably pale, their colour being lemon-yellow, the full yellow of 
these feathers in the other species approaching, particularly at its edge, to orange. The other 
has a richly coloured neck and chest, and thus approaches the birds of section C. Arranging 
them as the fourth and fifth species of the 6rst section A, they are distinguishable from all the 
other species, which have white chests, as the 
Ramph. citreopygus\ with the upper tail-coverts lemon-yellow. 
Ramph. osculans-, with the chest orange yellow in the middle, becoming paler towards its 
edges. 
Of the Ara 9 aris Pter. pluricinctus may be regarded as constituting a typical example ol’ 
the first section, A, differing, however, in the slight variation of colour that takes place in its sexes 
and in the additional black band of its under surface; a band of which a rudiment may be 
conceived to exist in the black pectoral spot of Pter. regalis. 
Pter. pluricinctus ; with the sides ofthc upper mandible, including the serratures, dirty white, 
the ventral band black in front and crimson behind, a strong black pectoral band. 
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