PREFACE. 
I AM induced to lay before the scientific world the present Monograph of a tribe of birds which 
has already claimed the attention of many of the most able ornithologists; first, because I am 
thereby afforded an opportunity of introducing to their notice several new species, which are 
here delineated for the first time; and secondly, from a desire to revise and set forth in as clear 
a light as possible the numerous species which this family contains, endeavouring at tlie same 
time to show their affinities to each other, by which they seem to divide themselves even into 
more minute groups than those of genera,—groups which are characterized by peculiar and 
unvarying though subordinate points of difference. These sections should, perhaps, be 
designated by some kind of nomenclature, and indeed it has been suggested to me that a 
distinguishing title to each is required. In this attempt, however, I do not feel myself quite 
warranted at present; but adhering to the established genera of Ramphastos and Ptey'oglossus, 
I have thrown the members of each together, as far as my views go, according to the indications 
of nature in their mutual affinities. 
I have spared no pains in order to obtain all possible information on the subject, having for 
this purpose visited and carefully examined most of the collections on the Continent, as well as 
those of our own island; and I beg to add, that every species I have figured is at present in 
existence, and has been personally inspected. I mention this expressly, because there are two 
or three species figured in Levaillant’s “ Oiseaux de Paradis,” as well as one or two others 
characterized in Professor Waglefs “ Systema Avium,” of which I have never yet been able to 
meet with examples. These I have omitted, being doubtful as to whether they ought to be 
regarded as the delineations of true species, or not; if they are, I hope at some future time to 
be enabled to discover them; but at present I am not sanguine as to their actual existence. 
I would here beg to express my obligations to those who have rendered me assistance in 
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