NO. 1116. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



607 



with one from Socorro Island, off west coast of Mexico, and three from 

 Louisiana, I find it impossible to detect any differences of coloration or 

 proportions that are not of a purely individual character. 



ASCERTAINED RANGE OF THE GENUS NYCTANASSA, STEJNEGER, IN THE GALArAGOtJ 



ARCHIPELAGO. 



1. Nyclanansa violacea (Linujeus). 



