1920] 



Swarth: Revision of Aviun Genus Passerella 



133 



Nevada, though there are several record stations of capture, the 

 number of individuals of insularis secured forms but a small per- 

 centage of the total number of Passerellas taken. The Pacific slope 

 of southern California apparently forms the main winter home of this 



Fasserella iliaca insularis 



DISTRIBUTION MAP 



MUSEUM OP VERTEBRATE ZOOLOGY 



UNlVERsrTY C 



Fig. R. Map showing stations of occurrence of Passerella iliaca insularis 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 this 

 subspecies ; in all probability most of the birds winter in the southern half of this 

 region. The general avoidance of the mountains of the interior is in marked 

 contrast to the distribution of the closely related unalaschoensis and sinuosa. 



subspecies, and even here there is apparentl}^ a local restriction to 

 regions fairly near the coast. Insularis is the most common form of 

 the Unalaschcensis group in the western part of the San Gabriel 



