160 BULLETIN : MUSEUM OF COMPAllATIVE ZOOLOGY. 



and we have found it impossible to pick out single skins. Still, as a whole, the 

 bird of the Pearl Islands is a trifle darker and grayer olive green on crown and 

 sides of head, and some examples are much more so than any from the main- 

 land. It is possible that in time a recognizable form will be developed in the 

 islands, but at present the slight differences are too inconstant to warrant giving 

 the bird a name. Some examples have the end of the bill yellow (so marked 

 on the labels by Mr. Brown), but usually it is dark-colored throughout. 



