PLATE 15. 



Fig. 1. View towards the east, of a portion of Scott River Valley, 

 Siskiyou County, California, about six miles north of Callahan, altitude 

 about 3,000 feet. Photograph taken June 13, 1911. The floor of the 

 valley is timbered with yellow pine, Cottonwood and willow. The hills 

 shown in the picture were not visited, but looked much drier and were 

 decidedly more sparsely timbered than the hills on the west side, at 

 the base of which camp was located. These western hills were well 

 covered with sage-brush, deer-brush and scattering groves of yellow pine. 

 The sandy ground of an old creek bed proved to be good trapping 

 ground for Dipodomys califomicus trinitatis. Other small mammals of the 

 lower lands were Peromyscus maniculatus gambelii, Eutamias amoenus 

 amoenus. Eutamias senex, and Citellus douglasii. On the sidehill Lepus vah- 

 fornicus califomicus was common. Dryobates pubescens gairdneri, As- 

 tragalinus tristis salicamans, Astragalinus psaltria hesperopliilus, Chon- 

 destes grammacus strigatus, Melospiza melodia fisherella, Pipilo macu- 

 latus falcinellus, Zamelodia melanocephala capitalis, Dendroica aestiva 

 brewsteri, Icteria virens longicauda and Penthestes atricapillus occi- 

 deutalis were birds which frequented the willow thickets along the small 

 creek beds. On the sidehill were seen Lophortyx californica vallicola, 

 Melanerpes form id varus bairdi and Piranga ludoviciana. The life-zone 

 may be considered mixed Upper Sonoran and Transition, prevalently 

 the former. 



Fig. 2. North side of Saloon Creek divide, Siskiyou County, Cali- 

 fornia, altitude 6,275 feet. Photograph taken July 10, 1911. A scattering 

 growth of silver pine and red fir on sidehill, and patches of alder along 

 creek bottom. As a collecting station the locality was chosen chiefly 

 because of the presence there of a colony of the golden-mantled ground 

 squirrel (Callospermophilus chrysodeirus trinitatis). The small Klamath 

 chipmunk (Eutamias amoenus amoenus) was almost as numerous and 

 there was abundant sign of gophers (.Thomomys monticola pinetorum). 

 The life-zone here represented was the Canadian division of the Boreal. 



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