300 
DU. R. W. SHUEELDt’s MORPHOLOGICAL 
previous to my quoting them*, and at the time I had not 
had an opportunity of personally examining the skeleton of a 
Trogon. In the present paper, however, the case will, in this 
respect, he different ; for, thanks to the kindness of Dr. P. L. 
Sclater, I have been enabled to study in this connection the 
skeletons of two different species of Trogon, which he has 
obligingly lent me for the purpose. Por other material I am 
under obligations to a number of friends, to whom I here desire 
to express my sincere thanks ; and I believe it will be found 
that in the proper column of the Table below I make due 
acknowledgments, by entering the names of the several donors 
opposite the specimens they have been so good as to send me. 
Indeed, had it not been for their kind and ready assistance, it 
would have been impossible for me to have completed the pre- 
sent work. Such material as I have been enabled to collect 
myself is also set forth in the Table in question. M} r thanks 
are further due to the Editors of ‘The Auk’ and of ‘ Eorest 
and Stream,’ for kindly inserting for me requests for specimens 
of birds in alcohol to be used in the present connection. 
Grlaucing over this list of material, it will be observed that, so 
far as the ordinary forms of the American Caprimulgine birds 
are concerned, it admits of giving a full account of their structure. 
The skeleton in these also may be conveniently compared with 
the skeleton in the two species of Trogons likewise represented ; 
and these latter with other types presented in the Table, as well 
as with such a skeleton as is presented in Geococcyx cali- 
fornianus, which I have elsewhere studied (Journ. Anat. and 
Phys. Loud. vol. xx. 1886, pp. 211-266) and published an 
account of its characters. 
Similarly „ we find the Nor t h- American Cvpseli very well 
represented, the only important form not found among my mate- 
rial being Cypseloicles niger , and all my efforts to secure specimens 
in alcohol of this interesting Swift have utterly failed f. In nry 
first contribution to the anatomy of these birds (P. Z. S. 1885, 
p. 886), I advanced the opinion that they were but profoundly 
modified Swallows, and should not be grouped Avith the Trochili 
in our classification of birds. AVe now have the opportunity 
* Forbes, W. A., “ Note on the Structure of the Palate in the Trogons 
( Trogonidce ),” P. Z. S. 1881, p. 836. 
1‘ I have since received alcoholic specimens of this form from my friend 
Prof. A. Newton, F.R.S., who kindly procured them from Jamaica for me. 
