PLATE 18 



a. Vouelsang Lake (altitude 10,300 feet) and Pass (10,700 feet), Hiidsoniau Zone; 

 photographed August 31, 1915. Eock talus at left and beyond, inhabited by Sierra 

 Pine Marten, Alpine Chipmunk, Gray Bushy -tailed Wood Eat, and Yosemite Cony; 

 meadow inhabited by Yosemite Meadow Mouse; willow thicket frequented by Hudsonian 

 White crowned Sparrow. Stunted ^\hite-bark pines on distant slopes. 



b. Looking eastward across Tuolumne Meadows; photographed July 13, 1915. 

 Meadows and forest are in Hudsonian Zone, distant bare ridges in Alpine-Arctic Zone ; 

 forest chiefly lodgepole pine. On the meadows were recorded the Yosemite Meadow 

 Mouse, Southern Sierra Marmot, Belding Ground Squirrel, Pacific Nighthawk, Spotted 

 Sandpiper, Killdeer, Hudsonian White-crowned Sparrow, and Mountain Bluebird ; at 

 the forest margin were the Mountain Weasel, California Badger, Golden-mantled Ground 

 Squirrel, Southern Sierra Marmot, Alpine Chipmunk, Sierra White-tailed Jack Babbit, 

 and Western Chipping Sparrow; in the main forest were the Tahoe Chipmunk, Sierra 

 Chickaree, Yellow-haired Porcupine, Arctic Three-toed Woodpecker, and Sierra Hermit 

 Thrush. 



[680] 



