BLACK-THROATED GRAY WARBLER 281 



by a California Striped Kacer upon a brood of Black-throated Gray 

 Warblers. The female parent was much excited, flying from twig to 

 twig, calling, and fluttering her wings. Near by, on the ground, was 

 one of the young warblers. There was good evidence that the snake 

 had already swallowed another member of the brood." This warbler 

 seems to have escaped any interference by cowbirds. 



Fall. — ^The southward migration begins in September and is mainly 

 accomplished during that month; Washington is generally vacated 

 during September, but migration continues through California during 

 the first half of October ; after the middle of October even southern 

 California is deserted, and the black-throated gray warblers have gone 

 to their winter haunts in Mexico. 



DISTEIBUTION 



Range. — ^Western North America from central British Colmnbia to 

 southern Mexico. 



Breeding range. — The black-throated gray warbler breeds north to 

 southwestern British Columia (Hagensborg and Lillooet). East to 

 southwestern British Columbia (Lillooet and Chilliwack) ; western 

 Washington (Bellingham and Leavenworth) ; central northern Ore- 

 gon (The Dalles) ; possibly southwestern Idaho (Eiddle) ; south- 

 western Wyoming, possibly (Mountain) ; western and southern Colo- 

 rado (probably Escalante Hills, Coventry, and the Culebra Range) ; 

 central New Mexico (Santa Fe) ; and northeastern Sonora (San Luis 

 Mountains). South to northeastern Sonora (San Luis Mountains) ; 

 southeastern to north-central Arizona (Huachuca Mountains, Santa 

 Eita Mountains, Santa Catalina Mountains, and Bill Williams Moun- 

 tain) ; and northeastern Baja California (Sierra San Pedro Martir). 

 West to northern Baja California (Sierra San Pedro Martir) ; west- 

 ern California (San Jacinto Mountains, Glendora, Santa Lucia Peak, 

 and Lakeport) ; western Oregon (Kirby, Coos Bay, Corvallis, and 

 Portland) ; western Washington (Spirit Lake and Shelton) ; and 

 southwestern British Columbia (Victoria, Stuart Island, and 

 Hagensborg) . 



Winter range. — The principal winter home of the black-throated 

 gray warbler is in western Mexico. It is found in winter north to ex- 

 treme southern Arizona (Yuma, occasionally in the Baboquivari 

 Mountains, and Tucson). East to southeastern Arizona (Tucson) ; 

 eastern Sonora (Tesia and Alamos) ; southwestern Durango (Cha- 

 cala) ; northern Michoacan (Patamban) ; Mexico (city of Mexico) ; 

 and central Oaxaca (Oaxaca). South to central Oaxaca. West to 

 western Oaxaca (La Parada) ; Guerrero (Chilpancingo) ; western 

 Michoacan (Los Eeyes) ; southern Sinaloa (Escuinapa and Mazat- 

 lan) ; southern Baja California (Victoria Mountains and San Jose del 



