316 University of California Publications in Zoology [Vol. in 



hills. It was found in May and June at Banning and Cabezon 

 north of the range in San Gorgonio Pass. The latter place is 

 about at the point where the Pacific flora and fauna gives place 

 to desert species, and the black-tailed gnatcatcher is here at the 

 eastern limit of its range, being replaced farther on by P. 

 plumbea. In the brush about Vallevista, at the western base, it 

 was one of the most abundant species. 



Seven specimens were collected: Cabezon. two (nos. 1743. 

 1744). Vallevista. five (nos. 3133-3137). Adults and young 

 taken at the latter point August 2!) \<< September 5, have about 

 completed the fall molt. 



Hylocichla ustulata ustulata (Nuttall) 

 Russet-backed Thrush 



Occurs in San Jacinto Mountains apparently as a migrant 

 only. At the northern base of the range, at Snow Creek and 

 Cabezon. during May. it was found passing through in some num- 

 bers. At Dos Palmos, during the last week in May, one or two 

 were seen or heard daily in the vegetation along the stream. 

 It was not encountered at any higher point in the mountains. 



Six specimens were collected: Cabezon, four (nos. 1720-1723), 

 Snow Creek, one (no. 2159), Dos Palmos, one (no. 2509). 



Sialia mexicana occidentalis Townsend 

 Western Bluebird 

 We found bluebirds in fair abundance in the mountains at 

 many points from 4500 feet upwards. At Kenworthy, the last 

 week in May, they were seen daily, at this time already feeding 

 young out of the nest. In the Santa Rosa Mountains, the last 

 of June, we found them in some numbers from the lower edge 

 of Transition (Garnet Queen Mine) up to the summit. On the 

 desert side of the range the only ones noted were a pair seen 

 in the upper part of Palm Canon, at about 3000 feet, June 12, 

 probably wandered down from the higher slope to the west- 

 ward, attracted by the water in the canon. In the higher parts 

 of the San Jacinto Mountains, at Schain's Ranch, Fuller's Mill, 



