Vol. xivn 

 1897 J 



Oberholser, Nevj Subspecies of Driidroica. 



79 



rather more yellowish than average Alaskan birds, they are still 

 with some difficulty to be distinguished from rubiginosa, bul 

 nevertheless are perhaps best considered as D. (estiva. 



The above remarks are, of course, based entirely upon adult 

 males, as the females and young of rubiginosa., from Alaska, are 

 apparently not certainly separable from corresponding plumages 

 of morcomi ^ though there are not at hand sufficient specimens 

 with sex and age properly determined, to permit a perfectly satis- 

 factory disposition of this point. 



The writer desires to express his indebtedness to Mr. Robert 

 Ridgway for kind permission to make use of the specimens in the 

 National collection ; and to Dr. Edgar A. Mearns for the privilege 

 of examining the Yellow Warblers collected by the naturalists of 

 the recent International Boundary Commission. 



Detailed measurements of Dendroica xstiva rubiginosa are given 

 below. 



Measurements of Breedinc; Specemens of DindroUa i^stiva rubiq-inosii. 



