Thus much, excepting the synonymy, was said in the first edition of this Monograph ; and I really have 
not much more to add, further than that my figures are made from Trinidad specimens. In order to throw 
as much light as possible^ on this somewhat intricate subject I have availed myself of Mr. Salvin s 
experience, which is embodied in the following note:— 
“ The first point to look to in determining a member of this very difficult section of the Trogonidae is to 
see if the crown of the head is black or blue. If the former, the bird doubtless belongs to T. caligatus, i. e. 
the caligatus of the second edition of this work. If the head is blue the bird belongs either to T. meri¬ 
dionalis, to T. ramonianus , or to a race closely allied to one or other of these birds—'the difference between 
the two named being further shown by the wing-coverts of the former being mottled grey and black, while 
in the latter these are almost wholly black. It is not always possible to distinguish birds belonging to the 
blue-headed group with certainty, as not unfrequently specimens occur which have the wing-coverts only 
slightly mottled, thus showing that indications are not wanting to prove that T. meridionalis and 
T. ramonianus gradually merge into one another. This fact determined Mr. Sclater and myself to place 
both under the name T. meridionalis in our ‘ Nomenclator Avium Neotropicalium.’ 
“ To Trogon meridionalis the name T. violaceus of Gmelin has been applied by several authors ; but this 
is a point I think that can never be satisfactorily determined ; and as Gmelin’s name is introduced with a 
description so manifestly inaccurate, for instance where he speaks of its yellow eyebrows ! the selection 
of the first name, about which there can be no doubt, is by far the preferable plan to be adopted. This 
undoubtedly is Swainson’s title bestowed upon this bird in 1838. It has been suggested (Mon. Trog. 
ed. 1, t. 9) that Spix’s name T. sulphureus might be intended for this species; and so far as the female is 
concerned I am inclined to think this may be so; but the male, I have less doubt, belongs to F. atricollis ; so 
that the name T. sulphureus had best be dismissed also. 
“ Swainson’s bird, which is still extant in the museum of the University of Cambridge, is said to have 
been obtained in the Bahama Islands by Mr. Lees. This locality is doubtless incorrect, as is also shown by 
other birds described by Swainson from Mr. Lees’s collection, and there is every reason to suppose that the 
specimen really came from Trinidad or Venezuela. 
Most unfortunately for the puzzling synonymy of this group of Trogons, Messrs. Cabanis and Heine did 
not consult the first Part of this edition of the * Trogonidae ’ when compiling their account of the family in 
the fourth part of the ‘ Museum Heineanum ;’ its existence was doubtless unknown to them. They would 
probably have been saved the attempt made to fix the name caligatus to a blue-headed bird from Cartagena, 
and also the description of the true T. caligatus of Central America under the new name of Aganus braccatus. 
Other species of this form are described by the same authors, the validity of which l have no means of 
testing beyond the published descriptions. These are :— Aganus lepidus, from Ecuador, which appears to 
me more likely to be T. caligatus than any thing else ; Aganus crissalis, from Bahia, whence I have never 
yet seen specimens (this bird is described as having a blue head); Aganus devillii, based upon a description 
by MM. Deville and Des Murs of a bird from Santa Maria, on the Upper Amazons, and supposed by them 
to be Trogon meridionalis of Swainson. Further research will be necessary to establish these supposed 
species. 
“ To M. Leotaud we are indebted for a knowledge of the habits of this bird, as observed by him in the 
island of Trinidad. He says it leads the same kind of life as T. viridis. 
The figures in the accompanying Plate are life-size, and from Trinidad specimens. 
