1920] Sivarth: Revision of Avian Genus Passerella 139 



sinuosa; from the Santa Cruz region 28 wintering sinuosa out of 90 

 Passerellas. On the other hand, from points in the Sierra Nevada 

 there are 23 wintering sinuosa out of a total of 51 Passerellas, and 

 from the San Diegan region, 124 out of a total of 396. 



An interesting feature of the winter distribution of sinuosa lies 

 in the manner of its occurrence in the San Diegan region (see table 3). 

 Sinuosa is the predominant winter fox sparrow in the foothills and 

 caiions at the eastern extremity of the San Gabriel Mountains. An 

 extensive series of Passerella from the Wright M. Pierce collection, 

 mostly from San Dimas and San Antonio canons, is available in the 

 present study, and there are some additional birds from the same 

 general region available from other sources. Out of a total of 178 

 winter specimens of Passerella from this section, 83 are sinuosa. Only 

 29 of the remaining 95 fox sparrows are representative of other sub- 

 species of the Unalaschcensis group {unalaschcensis, insularis, and 

 amiectem) . On the other hand, from the region about Pasadena and 

 in the adjacent mountains, toward the western extremity of the San 

 Gabriel Range, there are but nine wintering sinuosa out of a total 

 of 80 Passerellas. Here insularis is the predommant form. 



Specimens, to all appearances referable to sinuosa, from Corvallis, 

 Oregon, in January, from Netarts, Oregon, in December and January, 

 and from Mercer, Oregon, in February, are indicative of the wintering 

 of at least occasional individuals as far north as this. There are a 

 few winter birds at hand from scattered points in the interior of 

 northern California : the Siskiyou Mountains, October 31 ; Clear Lake, 

 December and February; Colusa, January; Eagle Lake, October 27. 

 Undoubtedly, however, the main winter home of siniwsa lies in the 

 foothills at the western base of the Sierra Nevada, and in parts of 

 the San Diegan region. 



The series from Prince William Sound includes specimens taken 

 from June 25 to September 2. While this gives no clue as to the date 

 of arrival on the breeding ground, it seems probable that the latter 

 date, September 2, is close to the time of final departure for the south. 

 Among the birds from California and Oregon there are scattered 

 specimens that were secured upon dates affording some information 

 regarding the time of arrival at the winter habitat and departure 

 therefrom. Of autumnal arrivals in the Sierra Nevada there are birds 

 from Sierra City, Sierra County, September 22; and from Horse 

 Corral Meadow, Fresno County, September 21. This latter date may 



