176 University of California Publioations in Zoology [Vol. 21 



three skins from Douglas County, Nevada, southeast of Lake Tahoe. 

 Two of these are about as small-billed as monoensis, while the third is 

 an average mariposae. 



Monoensis is not a strongly marked form, and its characters, such 

 as they are, obviously show intermediateness between mariposae and 

 canescens, between which races monoensis is situated geographically. 

 This fact may have some bearing on the relative restriction of the 

 region in which typical monoensis occurs. Doubtless also, a careful 

 working out in greater detail than has yet been done of the breeding 

 ranges of the several subspecies concerned will go far toward explain- 

 ing facts the meaning of which now seems obscure. 



There is little data at hand to indicate precise dates of arrival and 

 departure of the subspecies mariposae at the summer and winter 

 homes. In Kearsarge Pass, on May 27, male fox sparrows were in 

 full song, evidently settled at their nesting grounds, and on May 29 a 

 set of three well incubated eggs was taken. There is a female mari- 

 posae at hand (no. 29090, Mus. Vert. Zool.), which had laid part of 

 its set, taken May 15 at the head of Little Shasta River, Siskiyou 

 County, the northernmost point of record for the subspecies. Of fall 

 dates in the Sierra Nevada, there is a large series of mariposae at 

 hand taken at Cisco and Blue Cafion, Placer County, from August to 

 October, the latest from Blue Caiion, October 14. There is one bird 

 from Tuolumne River, Yosemite Park, October 1. There is one speci- 

 men at hand taken at Yermo, on the Mohave Desert, May 28. In view 

 of the above nesting dates this last must be regarded as an extremely 

 belated migrant. This bird is a typical example of mariposae ; the 

 point of capture, of course, is many miles from the nearest point in 

 this subspecies' summer habitat. Two specimens from Mt. Wilson, 

 Los Angeles County, taken April 1 and 4, respectively, may indicate 

 more nearly the usual limit of its stay in the spring in the south. 



Passerella iliaca Stephens! Anthony 

 Stephens Fox Sparrow 



Original description. — Passerella iliaca stephensi Anthony, 1895, p. 348. 



Type specime7i. — No. 15387, Carnegie Institute Museum ; male 

 adult; San Jacinto Mountains, California, at 8000 feet; July 14, ]895 

 (seep. 181). 



Range. — Summer visitant to upper Transition and Canadian zones 

 in the southern Sierra Nevada and the Sierras of southern California. 

 There are several isolated tracts occupied by this subspecies, namely : 

 in the Sierra Nevada, from Hume and Horse Corral Meadow, Fresno 



