1919 J Oberholser, Notes on North American Birds. 85 



Dendroica erithachorides castaneiceps Ridgway. 



The Golden Warbler commonly known as Dendroica bryanti 

 castaneiceps is apparently confined to the Pacific coast of Mexico 

 and Central America from Lower California to Costa Rica. Mr. 

 Ridgway, in his most recent review of the group, 1 treated this bird 

 as a subspecies of Dendroica bryanti Ridgway, from the Gulf coast 

 of Mexico and the Caribbean coast of Central America; and in 

 this opinion most subsequent writers have followed him. Exami- 

 nation of available material in various museums, including much 

 recently collected, particularly from Panama and Costa Rica, 

 the latter partly by Mr. Ridgway himself, shows now that Dendroica 

 bryanti is a 'Subspecies of Dendroica erithachorides Baird, from 

 northern Colombia and Panama, which Mr. Ridgway regarded as a 

 distinct species. The difference between these two birds consists 

 chiefly in the less heavily streaked breast and sides, and the thus 

 more abruptly defined exterior margin of the rufous of the throat 

 in Dendroica bryanti, together with the somewhat smaller size of 

 the latter. Intergradation takes place both in size and in the 

 character of the streaks on the lower parts; and there are speci- 

 mens which it is difficult to assign to one race or the other. Since, 

 therefore, Dendroica bryanti castaneiceps Ridgway 2 is but sub- 

 specifically separable from Dendroica bryanti Ridgway, 3 and as the 

 latter, as above shown, is but a subspecies of Dendroica eritha- 

 chorides Baird, it seems necessary to call the Mangrove "Warbler 

 of the Pacific coast of Mexico Dendroica erithachorides castaneiceps 

 Ridgway. 



> Bull. U. S. Nat. Mus., No. 50, part II, 1902, p. 530. 



2 Proc. U. S. Nat. Mus., VIII, Sept. 2, 1885, p. 350, footnote (La Paz, Lower California). 



3 Dendroica viellottii var. bryanti, Ridgway, Amer. Nat., VII, October, 1873, p. 605' 

 (Belize, British Honduras). 



