A REVISION OF THE RACES OF DENDROICA 



AUDUBONI. 



Harry C. Oberholser. 

 Washington, D. C. 



Identification of Arizona specimens of Dendroica auduboni 

 in the collection of the Biological Survey has made necessary 

 this investigation into the geographical forms of the species. 

 As these results are of some interest, it may be well to place 

 them on permanent record. 



Three subspecies of Dendroica auduboni have hitherto been 

 recognized — Dendroica audubo?ii auduboni, Dendroica auduboni 

 nigrifrons, and Dendroica auduboni goldmani — but to this 

 number another should apparently now be added. The 

 following conclusions are based chiefly on the considerable 

 series (248 specimens) in the United States National Museum, 

 including the Biological Survey collection, and comprising 

 types of three of the forms here recognized. The type of the 

 fourth, Dendroica nigrifrons Brewster, has also been examined. 



Dendroica auduboni auduboni Townsend. 



S[ylvia\. Auduboni Townsend, Journ. Acad. Nat. Sci. Phila., Ser. 1, 

 VII, pt. ii, November 21, 1S37, p. 191 ("forests of the Columbia River"). 



Chars. Subsp. — Size smallest, and with a minimum extent of black 

 on the lower parts. 



Measurements. — Male-.^ wing, 71.5-77 (average, 74.9) mm.; 

 tail, 55-60 (5S.2); exposed culmen, 9.5-lO.S (10.3); tarsus, 18.5-20 

 (18.6); middle toe with claw, 10-12.8 (11.8). 



Female:^ wing, 69.8-73.8 (average, 71.6) mm.; tail, 55.5-58 (56.6); 

 exposed culmen, 10-11 (10.3); tarsus, 19-19.8 (19.3); middle toe with 

 claw, 10.5-12.5 (11.6). 



Type Locality. Columbia River, near Fort Vancouver, 

 Washington. 



Geographic Distribution. Central British Columbia, 

 through the western United States, to southwestern Mexico. 

 Breeds north to central British Columbia; west to Vancouver 

 Island in British Columbia, western Washington, western 

 Oregon, and western California; south to southern California; 



1 Ten specimens, from Oregon,. Washington, and British Columbia. 



2 Six specimens, from Washington and British Columbia. 



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