110 



University of Calif ornia Puhlications in Zoology [Vol.21 



From certain of the fauiial areas the numbers of birds examined 

 were too small for the results to have much significance, but there are 

 certain facts in winter distribution that the chart shows very clearly. 

 Attention may be called to the demonstrated preponderance of 

 annectens in the Marin, San Francisco Bay, and Santa Cruz sections, 

 compared with its absence from the Humboldt Bay section directly 

 to the northward, and the limited numbers found elsewhere in the 

 state; the preponderance of townsendi in the Humboldt Bay section, 



Fig. I. Map of southern California indicating the position of the localities 

 designated in the text as (1) the Santa Monica Mountains region, (2) the Pasa- 

 dena region, (3) the Claremont region. 



and the few individuals taken at other points ; and similar restrictions 

 in range shown by certain other subspecies. 



From the Sierra Nevada, Humboldt, Marin, Santa Cruz, San 

 Francisco Bay, and San Diego regions, there are sufficient winter 

 specimens to warrant some generalizations. From the San Diego 

 region (with which is included the San Bernardino Mountain region) 

 there are enough birds available to permit of analysis of conditions 

 at several localities within this area, such as can not be done elsewhere 

 in the state. Of the 396 winter collected specimens of Passerella from 

 the San Diego region, 326 were taken from three relatively restricted 

 areas, in Los Angeles and San Bernardino counties. These poiuts I 

 have designated as follows (see fig. I) : (1) Santa Monica Mountains 

 region (Coldwater Canon, Franklin Canon, Hollywood, etc.) ; (2) 

 Pasadena region (Arroyo Seco, Millard Canon, Mount Wilson, etc.) ; 

 (3) Claremont region (San Antonio Caiion, San Dimas Canon, Lytle 



