148 



AUDUBON'S WARBLER 



and spotted basally with black, a yellow tuft on each side of the breast, 

 flanks indistinctly streaked with black; belly white. 



Young i3, Fall. — Similar to adult c? in Fall but browner above, the streaks 

 less pronounced; yellow of throat paler and with yellow on sides less pro- 

 nounced; breast and sides browner, the black markings less evident. 



Adult 2, Spring. — With a general resemblance to the adult c? in Fall, but 

 crown-patch often tipped with black, the rump paler, the breast somewhat 

 blacker. 



Adult 2, Fall. — Not certainly distinguishable from young <? in Fall. 



Young 2j Fall. — Resembles adult 2 in Fall but is browner above, the 

 streaks and crown-patch less evident; breast browner, throat with less yellow 

 or, rarely, with none at all; white in tail diminished in amount but nearly 

 always reaching to fourth feather. 



Nestling. — Resembling nestling of Dendroica coronata; above brown 

 streaked with black and white; below white streaked with black; wings and 

 tail as in young c? in Fall, but greater coverts tipped and not margined with 

 whitish. 



General Distribution. — Western United States; north to British 

 Columbia and South Dakota; east to the Plains. 



Summer Range. — This is one of the most common Warblers of 

 the Pacific slope ; it breeds from southern California ( San Bernardino 

 Mountains), and Nevir Mexico (Wheeler Park, Tres Piedras), north 

 to British Columbia (is8-Mile House), Alberta (Calgary), Montana 

 and South Dakota (Black Hills) ; east to northeastern Nebraska 

 (Sioux Co.), and western Texas (Fort Davis, Guadalupe Mountains). 

 Accidental in Massachusetts (Cambridge, November 15, 1876) and 

 in Pennsylvania (Chester Co., November 8, 1899). , 



Winter Range. — Guatemala and Mexico, north to the Rio Grande ; 

 through most of the valleys of California to southern Oregon and 

 rarely to southern British Columbia. 



Spring Migration.- 



