1913] Grinnell-Sivarth: Birds and Mammals of Ran Jacinto 315 



the most abundant species of bird, in full song, and undoubtedly 

 breeding in the neighborhood. At Dos Palmos, on the desert 

 side, occasional individuals appeared about the springs, but these 

 had probably strayed down from the waterless Upper Sonoran 

 chaparral slopes above. In the Santa Rosa Mountains one or 

 two were seen at Garnet Queen Mine, and two individuals near 

 the summit of Santa Rosa Peak, June 29. 



The upper limit of the species in the San Jacinto Mountains 

 may perhaps be indicated by its occurrence in fair abundance at 

 Schain's Ranch (4900 feet), in lesser numbers at Fuller's Mill 

 (6000 feet), and a single bird at Idyllwild (6000 feet), seen July 

 3. During the first week in May they were common at Cabezon, 

 at the northern base of the mountains, but they may well have 

 been migrating at that time, and no evidence was forthcoming 

 (if their breeding in the vicinity. 



At Hemet Lake during the first two weeks in August gnat- 

 catchers were migrating in large numbers, and on Thomas .Moun- 

 tain (6800 feet), during the ensuing week, they were also fairly 

 numerous. 



Twelve specimens were taken, from the following points : 

 Cabezon, one (no. 1742), Schain's Ranch, three (nos. 1802-1804), 

 Fuller's Mill, one (no. 2016). Kenworthy, six (nos. 2270-2275), 

 Hemet Lake, one (no. 3004). 



Polioptila plumbea (Baird) 



Plumbeous Gnatcateher 

 Several were observed and an adult male secured (no. 3091), 

 in a clump of desert willow between the mouths of Palm and 

 Murray canons. June 15. About Dos Palmos during the third 

 week in August, gnatcatchers w^ere occasionally seen in the brush, 

 and the two specimens secured (nos. 2534, 2535), both in the 

 juvenal plumage, proved to be of this species. These were the 

 only occasions ou which the species w T as encountered in the region. 



Polioptila californica Brewster 



Black-tailed Gnatcateher 



In the San Jacinto region this species proved to be confined 



strictly to the Lower Sonoran zone at the western and northern 



bases of the range, occurring nowhere above the very lowest foot- 



