Vol. XIV 
feg7 OBERHOLSER, Vew Subspecies of Dendroica. 79 
rather more yellowish than average Alaskan birds, they are still 
with some difficulty to be distinguished from rudiginosa, but 
nevertheless are perhaps best considered as D. e@stiva. 
The above remarks are, of course, based entirely upon adult 
males, as the females and young of rudzginosa, 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 estiva rubiginosa are given 
below. 
MEASUREMENTS OF BREEDING SPECIMENS OF Dendroica estiva rubiginosa. 
Middl 
US a Sex. Locality. Wing. | Tail. Erpored Tarsus. Toe with 
Claw. 
— een aie eee Es 
131807 | &@ | Kadiak Island, Alaska.| 65.3 | 44.2 D7] || sisi | ales 
70106 | & se ee ee 64. 45; Aen NLS23" |) V5.2 
54429 | o a ce Gt (a7 || Wiper WO || Ww |) a6 
Yukon R., mouth of ee 
27267 | b Porcupine R., Alaska. SA EES Seal +9. nie 
86517 | @ | Nushagak, Alaska. G3a5r 4327, 9-9 | 17-3 | 14.2 
54425 | d | Yukon River, Alaska. | 61.5 | 43.2 OG) || ws || Tse 
153279 | @ | Victoria, Brit. Columbia.| 63.5 | 43.9 NOVA L7zeon|| LAL7 
153280 | & a cs cL 62-2 | 44.2 9.9 | 18.5 | 14.5 
153278 | o a e cs 62-2 |) 43:7 10:2) | E78 |) w4ee 
Average. 63. 44.4 9.9 INeoIe 3} dt Ls lo 
| 
