1920] 



Swarth: Revision of Avian Genus Passerella 



121 



the spring. The Horse Corral Meadow bird was taken on an expe- 

 dition headed by the present writer, and, as observed by him, was one 

 of a "wave" of migrating northern fox sparrows which had just 



O Passerella iliaca altivagans 



DISTRIBUTION MAP 



MUSEUM OF VERTEBRATE ZOOLOGY 

 UNivtfumr OP CALiPownA 



Fig. M. Map showing stations of occurrence of Passerella iliaca altivagans in 

 California, as established by specimens examined by the author. The region 

 enclosed within the dotted outline is believed to be the main winter habitat of the 

 subspecies. 



arrived in a region where we had been collecting birds for some time. 

 It may therefore be regarded as quite accurately representing the 

 arrival of the subspecies there in that year. 



Passerella iliaca altivagans was described by Riley (1911, p. 234) 

 upon the basis of four young birds, three from the Moose Pass region, 



