PLATE 1 



(Reproductions of photographs made direct from the specimens by the 

 author.) 



EXPLANATION OF FIGURE 



1 Left lateral view of the skeleton of a subadult specimen of the hoatzin 

 tOpisthocomus cristatus); two-thirds natural size. From Mr. Robert Cushman 

 Murphy, and prepared at the United States National Museum, to which institu- 

 tion it was presented by the author. (No. 223903.) 



608 



