THE BLACK-THROATED GRAY WARBLER. 187 
Recognition Marks.—Warbler size; black and white and blue-gray colora- 
tion distinctive. 
Nesting.—WNest: a rather loosely built structure of dead grasses, silky plant 
fibers, moss, etc., placed midway on horizontal limb of conifer 25-50 feet from 
ground; measures, externally, 3 inches wide by 2 deep, internally 134 wide by 1 
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 (21x16). Season: last week in May and first week in June; one brood. 
atl lan Wyooks- 
BLACK-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. stale x. 
Migrations.—S pring: Seattle-Tacoma c. April 12. Fall: c. Sept. 1 (Blaine). 
Authorities.— Sylvia nigrescens Townsend, Journ. Ac. Nat. Sci. Phila. Walle 
1837, 191 (‘forests of the Columbia River”). C&S. Lt. D*(?). Ra. Kk. B. E. 
Specimens.—U. of W. Prov. B. E. 
