254 University of California Publications in Zoology [Vol.10 



Eleven specimens were collected: Cabezon, two (nos. 1700, 

 1701), Schain's Ranch, one (no. 1787), Poppet Flat, one (no. 

 2002), Strawberry Valley, two (nos. 2591, 2592), Round Valley, 

 two (nos. 2216, 2217). Hemet Lake, one (no. 2988), and the 

 mouth of Palm Canon, two (nos. 3076, 3077). 



Nuttallornis borealis (Swainson) 

 Olive-sided Flycatcher 



Observed in some numbers over most of the range, migrating 

 at the lower levels in .May and June, and later on found breed- 

 ing at the higher points visited. In Hemet Valley, at Ken- 

 worthy and Vandeventer Flat, they were seen migrating up to 

 June 2. On the north slopes of the mountains, at Cabezon in 

 .May. and at Snow Creek the first week in June, they were daily 

 seen passing through. Birds observed at Fuller's Mill toward 

 the end of June, mi Santa Rosa Peak at the end of June, in 

 Strawberry Valley. Tahquitz Valley, and Round Valley, in July, 

 were undoubtedly nesting. In Strawberry Valley a nest was 

 found en July 9. placed in a small clump of mistletoe near the 

 end of a drooping cedar bough, about twenty feet above the 

 hillside. It was nut looked into, but probably contained young, 

 as one of the parents arrived with insects in its bill. 



In August they were seen about Hemet Lake, evidently begin- 

 ning to wander from the breeding grounds, and also on Thomas 

 Mountain. None was encountered at any time along the desert 

 base of the mountains, at Dos Palmos or in Palm Canon, though 

 they mi-lit be expected to occur there during the migrations. 



Ten specimens were collected: Cabezon, seven (nos. 1672- 

 1678), Vandeventer Flat, one (no. 2302), Santa Rosa Peak, one 

 (no. 247(1). and Strawberry Valley, one (no. 2585). 



Myiochanes richardsoni richardsoni (Swainson) 



Western Wood Pewee 



A common species, nesting in abundance from high Upper 



Sonoran upwards. At lower points it was encountered migrating 



in some numbers, at Cabezon early in May, at Dos Palmos from 



May 26 to June 1, and at Snow Creek and Whitewater, June 



