1913] Grinnell-Swartli: Birds and Mammals of San Jacinto 205 



many instances Upper Sonoran and Transition species of birds 

 could be seen or heard at the same time at the sharply, denned 

 boundary between the two zones ; but each usually remained well 

 within its own zone. We remained here from June 25 to June 28. 



Santa Rosa Peak 



Our camp at this point, two hours' climb from the Garnet 

 Queen Mine, was in a gulch about half a mile north of the sum- 

 mit of Santa Rosa Peak, and at an altitude of about 7500 feet. 

 We found here a small spring, barely sufficient for our needs, 

 but the only water anywhere about the summit of the mountain. 

 Collecting was carried on all along the ridge between Santa Rosa 

 and Toro peaks. This divide, the highest part of the Santa Rosa 

 Mountains, runs east and west. A slightly higher eminence 

 (Santa Rosa Peak, 8046 feet) is at the west end, and a still 

 higher one (Toro Peak. 8705 feet), is about three miles away 

 at the east end. On the south side of the ridge the slopes are 

 steep, down to the chaparral-covered foothills ; on the north side 

 much less so down to the Pinon Flat country. The summit of 

 the ridge and the northern slope down to about 6500 feet, on 

 an average, are well timbered with large trees, the forest being 

 usually open, with very little underbrush. The trees are sugar 

 pine, yellow (or Jeffrey) pine, silver fir and incense cedar. On 

 the summit of Toro Peak, and down two hundred yards from 

 the top, there are stunted limber pines (Pinus flex His), but firs 

 and Jeffrey pines also extend to the summit. 



On the whole we considered the entire timbered area of the 

 Santa Rosa Mountains as Transition, with extreme Upper Transi- 

 tion on Toro Peak. The limber pine seen at the latter point was 

 the only higher zone plant observed, and there were none but 

 Transition birds and mammals encountered. A possible exception 

 to this statement was afforded by the observation of two Clarke 

 nutcrackers; but at this season of the year these may well have 

 been wanderers from the nearby San Jacinto Mountains. In fact 

 the species was also encountered in the sagebrush at Kenworthy. 



We were on Santa Rosa Mountain from June 28 to July 1. 



