PLATE 12 



Fig. 1. View of a part of the largest meadow in the mountains; 

 July 18, 1909. This is located at an altitude of 6500 feet on the western 

 slope of the Pine Forest Mountains, Humboldt County, Nevada. Duffer 

 Peak (9400 feet altitude), the highest point in the mountains, appears in 

 the center background. The whitish brush on the slope in the foreground 

 is Artemisia tridentata. The trees on the meadow, and the brush-like 

 patches on the ridges and in the broad basin in the background are 

 Populus tremidoides. Citellus oregonus was extremely numerous on this 

 meadow. A coyote (Canis testes) was seen here on the afternoon of July 

 18. Cinclus mexicanus unicolor was observed on Alder Creek both above 

 and below this locality. 



Fig. 2. Alder Creek (6000 feet altitude, near Camp no. 7), Pine Forest 

 Mountains, Humboldt County, Nevada; July 15, 1909. The trees are, for 

 the most part, Populus tremuloides, all the brush-like patches in the back- 

 ground as well as nearly all the trees along the stream being of this 

 species. Associated with the aspens along the stream are a few willows. 

 The hillsides are clothed with Artemisia tridentata. Zapus princeps 

 oregonus, Putorius cicognani, and Neotoma cinerea occidentalis were taken 

 at this locality. Citellus oregonus ranged down nearly to it, and Sylvilagus 

 auduhoni grangeri invaded the mountains along exposed ridges to a greater 

 altitude than that of this camp. This is a fair illustration of an inter- 

 mingling of lower and higher zonal elements. The locality is on the 

 whole good Transition, at least along the stream. 



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