SALT-MARSH YELLOWTHROAT 575 



Migration in the autumn begins in August and continues through 

 October. There are numerous winter records of the western yellow- 

 throat in California, so that fall as well as spring records mean little 

 in following migration. It has been recorded at San Bernardino 

 Ranch, Sonora, Mexico, August 26 to September 8, 1892 ; and at San 

 Pedro River, October 7 to 15, 1892. 



GEOTHLYPIS TRICHAS CAMPICOLA Behle and Aldrich 



NORTHERN PLAINS YELLOWTHROAT 



Contributed by James Lee Petees 



HABrrs 



The breeding yellowthroat of the northern Rocky Mountains and 

 northern Great Plains region was named by Behle and Aldrich (1947) 

 who characterized the race as follows : 



Similar to Oeothlypis trichas occidentalis of the Great Basin, but upper parts 

 grayer, less yellowish olive green ; yellow of underparts less extensive posteriorly ; 

 belly and flanks grayer, averaging more whitish, less buffy. Similar to O. t. 

 (irizela of the humid coast belt west of the Cascade Range, but also grayer on up- 

 per parts ; white frontal stripe broader ; yellow of under parts slightly paler and 

 less extensive; posterior underparts whiter, less buffy. The range assigned to 

 this race by its describers is as follows : "Breeds east of the Cascade Mountains 

 in northern Oregon, Washington, and British Colombia, thence east through 

 northern Idaho, Alberta, Saskatchewan, Montana, northern Wyoming to north- 

 ern North Dakota. In migration occurs southward in Utah, Colorado, and Ari- 

 zona. Winter range undetermined. 



GEOTHLYPIS TRICHAS SINUOSA Griimell 



SALT-MARSH YELLOWTHROAT 



Conteibuted by Alfred Otto Gross 



HABrrs 



The salt-marsh yellowthroat is known also as the San Francisco 

 yellowthroat because of its restricted distribution chiefly in the region 

 about that city. This form was described by Joseph Grinnell (1901) 

 as follows : "Similar to Geothlypis trichas occidentalism but dorsally 

 and laterally darker in color, and size much less. Thirteen specimens 

 (males) from the marshes of San Francisco Bay measure: Wing 51 

 mm. to 54.6 mm. averaging 53 mm.; tail 52.6 to 56.6 mm. averaging 

 55 mm." 



Grinnell and Miller (1944) give an account of its status, range, and 

 haHtat as follows : 



Status — Resident ; but to some degree scatters or migrates from breeding range 

 in San Francisco Bay region to appear, fairly commonly, as a winter visitant 



