152 



University of California Fuhlicaiions in Zoology [Vol. 21 



example) that we know to vary in numbers from year to year, and 

 it may be that among the subspecies of the fox sparrows also there is 

 this question of fluctuating numbers (or even total absence some 

 winters compared with relative abundance during others) to make still 

 more complicated the already involved problem of the migration and 

 distribution of the different forms. 



One specimen of fuliginosa at hand (no. 27153, Mus. Vert. Zool.), 

 like the Berkeley birds in appearance, was taken at Bear Flat, San 

 Antonio Caiion, San Gabriel Mountains, California, on November 30, 

 1916. This is by far the southernmost record for the subspecies. 



Fig. W. Wings of three subspecies of fox sparrow of the Schistacea gToup, 

 natural size. 



a. Passerella iliaca schistacea, adult male ; no. 9054, Mus. Vert. Zool. ; Pine 

 Forest Mountains, Nevada; June 19, 1909. 



h. Passerella iliaca mariposae, adult male; no. 29089, Mus. Vert. Zool.; Sisson, 

 Siskiyou County, California; May 15, 1918. 



c. Passerella iliaca stephensi, adult male; no. 3426, coll. G. F. Morcom; Bear 

 Valley, San Bernardino Mountains, California; June 10, 1886. 



Passerella iliaca schistacea Baird 

 Slate-colored Fox Sparrow 

 Original description. — Passerella schistacea Baird, 1858, p. 490. 



Type specimen. — No. 5718, U. S. Nat. Mus.; female; "Platte river, 

 K. T." (= "South Fork of Platte River, about 25 miles east of 

 northeastern corner of Colorado, Nebraska" [A. 0. U. Check-List, 

 1910, p. 277]) ; July 19, 1856; collected by Lt. F. T. Brj^an (original 

 number 131). 



Range. — The summer habitat is principally in the high mountains 

 of the Great Basin region, north into Alberta, south into Nevada and 

 east probably to eastern Wyoming. In winter south to southern 

 California and (casually, at least) to southern Arizona. Occasional 

 in migration in western Nebraska and Kansas, 



