166 University of Calif orivia Publications in Zoology [Vol. 21 



Remarks. — Although hrevicauda is one of the more recently differ- 

 entiated local races of the species, it so happens that there is more 

 information at hand regarding the seasonal distribution of this sub- 

 species than there is regarding that of any of its near relatives. The 

 available data include facts of decided interest, the locally restricted 

 winter habitat being especially worthy of emphasis. In its summer 

 home hrevicauda occupies the westernmost point of any of the 

 scMstacea group, and in its winter home also it keeps just as far to 

 the westward as possible. Other closely related subspecies occur quite 

 as far west, it is true, but hrevicauda in winter does not extend east- 

 ward (inland) for any distance, as do the others. It hugs the near 

 vicinity of the coast. The local restriction of the race in Marin 



Fig. AA. Feet of two subspecies of fox sparrow, natural size. 



a. Passerella iliaca stephen^i, adult female; no. 2096, Mus. Vert. Zool. ; San 

 Jacinto Mountains, California; July 10, 1908. 



h. Passerella iliaca hrevicauda, adult male; no. 23922, Mus. Vert. Zool.; youth 

 Yolla Belly Mountain, Tehama County, California; August 1, 1913. 



County, just north of San Francisco Bay, has been commented upon 

 by Mailliard (1912, p. 63). Here it occurs in winter apparently with 

 fair regularity upon certain rocky, brush-covered ridges near the coast, 

 and nowhere else. East of San Francisco Bay, on the University of 

 California campus, this subspecies has not yet been detected among 

 the several kinds of fox sparrows that frequent these grounds in 

 winter. Neither is it included in the extensive series of Passerella 

 collected over a period of years at Hayward, a few miles to the 

 southward, by W. Otto Emerson. 



South of San Francisco Bay there are no record stations for this 

 subspecies until Santa Barbara is reached, though it can hardly be 

 doubted that it occurs in winter at suitable spots. In this region, as 

 elsewhere, it is probably restricted to certain limited areas. In Los 

 Angeles County the peculiarly local distribution of the race receives 

 special emphasis from the large number of specimens of Passerella 

 available from many points within the county, rendering it out of all 

 question that the predominance of certain subspecies at certain spots 



