THE BLACK-THROATED GRAY WARBLER. 



187 



Recognition Marks. — \\'arbler size ; black and white and blue-gray colora- 

 tion distinctive. 



Nesting. — Xcst: a rather loosely built structure of dead grasses, silky plant 

 iibers, moss, etc., placed midway on horizontal limb of conifer 25-50 feet from 

 ground; measures, externally, 3 inches wide by 2 deep, internally 1}^ wide by i 

 deep. Eggs: 4, creamy white, marked, chiefly about the larger end with spots 

 and small blotches of varying shades of brown, lavender and black. Av. size. 

 .83 X .63 ( 21 X 16). Season: last week in May and first week in Tune ; one brood. 



I>|ll(mtavool\s. 



BL.\CK-THROATED GRAY WARBLERS, MALE AND FEMALE. 



General Range. — Western United States (north to Colorado, Utah and 

 Washington), and British Columbia west of the Cascades; breeding southward 

 to Southern California, southern Arizona and Lower California; south in winter 

 thru Mexico and States of Oaxaca and Vera Cruz. 



Range in Washington. — Summer resident and migrant west of the Cascade 

 Mountains. 



Migrations. — Spring: Seattle-Tacoma c. April 12. Fall: c. Sept. i (Blaine). 



Authorities. — Sylvia niqresccns Townsend, Journ. Ac. Nat. Sci. Phila. VH. 

 1837, 191 ("forests of the Columbia River"). C&S. L-. D'( ?). Ra. Kk. B. E. 



Specimens. — LT. of W. Prov. B. E. 



