298 University of California Publications in Zoology [Vol. 10 



The Tahquitz Valley birds are all immature, one or two in 

 juvenal plumage, and one or two in fully acquired first winter 

 plumage, but most of them in the midst of the post-juvenal molt. 

 The Thomas Mountain specimen, collected August 17, is an 

 adult female in fresh winter plumage. 



Dendroica aestiva rubiginosa (Pallas) 

 Alaska Yellow Warbler 

 In the vicinity of Dos Palmos, May 2l> to June 2, migrating 

 yellow warblers were seen daily, usually flitting hastily along 

 through the line of vegetation bordering the creek. Three 

 secured, a male and two females (nos. 2539-2541), proved to 

 belong to this northern subspecies. It seems probable that all 

 of these late migrants were of this form, as at this time the 

 breeding yellow warbler of southern California has already 

 begun nesting. 



Dendroica aestiva brewsteri (irinnell 

 California Yellow Warbler 



The vicinity of Cabezon, at the northern base of the moun- 

 tains, was the only place where yellow warblers were observed 

 in any numbers. They were abundant here during May, and 

 nesting in the neighborhood, as some were noted carrying nest 

 material. But few were seen elsewhere in the mountains. Some 

 were noted at Keen's Camp, July 5. apparently their eastward 

 breeding limit in Ilemet Valley, as the species was not encoun- 

 tered at Kenworthy. There were a few in the trees along the 

 streams in Strawberry Valley, where they could be heard singing, 

 though seldom seen. 



Other points of record were Snow Creek, Banning, and Ful- 

 ler's .Mill in June, and a few migrants at Tahquitz Valley. July 

 25 and 28, at Ilemet Lake. August 5 to 14, and at Dos Palmos, 

 August 25 and 26. 



Fifteen specimens were preserved: Cabezon, nine (nos. 1747- 

 1753, 2126, 2127), Snow Creek, one (no. 2156), Strawberry 

 Valley, two (nos. 2604, 2605), Tahquitz Valley, one (no. 2804), 

 and Dos Palmos, two (nos. 2537. 2538). 



