PLATE 17. 



Fig. 5. View taken July 23, 1911, looking towards head of Grizzly 

 Creek, Trinity County, California, altitude about 6,000 feet. The timber 

 is white pine, red fir, and hemlock, scattered through a meadow and 

 reaching up on the rocky slopes of Thompson Peak, the summit in the 

 background. A bank of perpetual snow feeds a lake from which a water- 

 fall (shown in left center) descends to form Grizzly Creek. Small mam- 

 mals were not numerous but included Microtus mordax mordax, Zapus 

 trinotatus alleni, and the two species of Eutamias, amoenus and senex. 

 Aplodontia chryseola was fairly abundant on the west side of the canon, 

 and a number of black-tailed deer were seen in the neighborhood. Birds 

 noted were: Nuttallornis borealis, Cyanocitta stelleri frontalis, Junco 

 oreganus thurberi, Lanivireo sohtarius cassini, Vermivora rubricapilla gut- 

 turalis, Vermivora celata lutescens, Dendroica auduboni auduboni, Den- 

 droica occidentalis, Certhia familiaris zelotes, Penthestes gambeli gambeli, 

 Regulus satrapa olivaceus, Hylocichla ustulata ustulata, Hylocichla ustu- 

 lata swainsoni (one specimen). The life-zone represented is evidently 

 Boreal, in its Canadian and Hudsonian divisions. 



Pig. 6. View taken July 31, 1911, looking southwest from head of 

 Rush Creek, Siskiyou County, California, towards the Salmon Mountains; 

 altitude about 6,400 feet. A typical Boreal meadow of luxuriant grasses, 

 with thickets of alder and patches of hellebore. Red firs skirt the edge 

 of the meadow and, interspersed with hemlock, extend in dense stand 

 to the top of the divide. Below the meadow the silver pine and cedar 

 predominate. Small mammals taken in and near the meadow were: 

 Sorex vagrans amoenus, Peromyscus maniculatus gambelii, Microtus mor- 

 dax mordax, Thomomys monticola pinetorum and Zapus trinotatus al- 

 leni. Glaucomijs sabrinus fhiviventris was abundant in the groves of 

 red fir, and in a side canon three marten (Martes caurina caurina) were 

 secured. Birds were confined chiefly to the meadow and its vicinity, and 

 included Oreortyx picta picta, Dendragapus obscurus sierrae, Cyanocitta 

 stelleri frontalis, Junco oreganus thurberi, Melospiza lincolni lincolni, 

 Dendroica occidentalis, Penthestes gambeli gambeli and Hylocichla gut- 

 tata slevini. 



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