( 458 ) 



BLACK-THROATED BLUE WARBLER. 



Sylvia canadensis, Lath. 



PLATE CLV. Vol. II. p. 209. Male. 



PINE-SWAMP WARBLER. 



Sylvia sphagnosa, Bonaparte. 



PLATE CXLVIII. Vol.. II. p. 279. Female or Youvg. 



The birds represented in the plate last mentioned are the young of the 

 Black-throated Blue Warbler, Sylvia canadensis, Plate CLV., the female of 

 which resembles them so much that I looked upon it as of a species dis- 

 tinct from the male. I have no doubt that this error originated with 

 Wilson, who has been followed by all our writers. Now, however, 

 the Sylvia or Sylvicola sphagnosa of Bonapahte, which he altered from 

 Wilson's S. pusilla, must be erased from our Fauna. This bird extends 

 to the head waters of the Missouri, but is not mentioned as occurring 

 in the Fur Countries. I found it abundant on my way to the Texas 

 in the beginning of April ; I have also seen it plentiful in June about 

 Boston, where, however, it does not breed. Of this fact also I gave the 

 first intimation to the Prince of Mdsxgnano. 



BLACK-AND-YELLOW WARBLER. 



Sylvia maculosa. Lath. 



PLATE CXXIII. Vol. II. p. 145. 



This beautiful Warbler is, according to Dr Richardson, a com- 

 mon bird on the banks of the Saskatchewan River, where it enlivens 

 the thickets of young spruce trees and willows with its agreeable notes. 

 It was not observed by Dr Townsend on the Rocky Mountains or along 

 the Columbia River. As I proceeded towards the Texas, in the be- 

 ginning of April, I found it in considerable numbers on its way toward 

 the United States. The eggs measure five-eighths and three-fourths 

 in length, four-eighths and a half in breadth ; in some instances the 

 ground-colour is slightly tinged with very pale yellow. 



