1920] 



Swarth: Revision of Avian Genus Passerella 



131 



occurs also in the Sierra Nevada. October 6 is an early date of arrival 

 in the Yosemite region, October 7 in southern California. In the 

 spring unalaschcensis lingers rather late, as shown by two birds taken 

 in Ventura County on IMay 2 and 3. 



Unalaschcensis is one subspecies that may prove to winter well 

 south into Lower California, and from the data afforded by the series 

 at hand I am inclined to believe that it does so. The San Pedro Martir 



Fig. Q. Wings of four subspecies of fox sparrow of the Unalaschcensis group, 

 natural size. 



a. Passerella iliaoa unalaschcensis, immature male; no. 26031, Mus. Vert. Zool. ; 

 near Yosemite Point, Yosemite National Park, California; October 30, 1915. 



b. Passerella iliaca slnuosa, adult male; no. 1535, Mus. Vert. Zool. ; Hinchin- 

 brook Island, Prince William Sound, Alaska ; June 25, 1908. 



c. Passerella iliaca toivnsendi, adult male; no. 495, Mus. Vert. Zool.; Admiralty 

 Island, Alaska; May 4, 1907. 



d. Passerella iliaca fuliginosa, male; no. 27152, Mus. Vert. Zool.; Blue liake, 

 Humboldt County, California; December 4, 1916. 



region, at least, should offer suitable surroundings for fox sparrows 

 in winter. There is no information at hand regarding the winter bird 

 population of those mountains, and it will be of interest to note the 

 nature of occurrence of Passerella in the range. 



A specimen from Tacoma, Washington, on January 10, and one 

 from Portland, Oregon, November 7, are possibly indicative of winter 

 visitants at these points, surely the extreme northern limits of the 

 subspecies in winter. The Portland bird is not a typical example of 

 unalaschcensis, and is apparently an intergrade toward sinuosa. One 

 from Salem, Oregon, April 24, was probably a migrant. 



