288 University of California PuhUcations in Zoology [Vol. 21 



Microtus mordax sierrae, new subspecies 



Sierra Nevada Meadow Mouse 



Microtus mordax, Bailey (1900, p. 48), part. 

 Microtus mordax, Elliot (1907, p. 296), part. 

 Microtus mordax mordax, Miller (1912, p. 221), part. 



Type specimen. — Male adult; no. 22437, Mus. Vert. Zool. ; Tuolumne 

 Meadows, Yosemite National Park, 8600 feet altitude, Tuolumne 

 County, California; July 7, 1915; collected by Charles L, Camp; 

 original no. 2159. 



Range. — The Sierra Nevada, White and Trinity mountains, of 

 eastern and northern California, from Taylor Meadow, Tulare County, 

 north to Lassen Peak and Goose Nest Mountains, Siskiyou County, 

 and adjoining parts of Oregon. (Extralimital range unknown.) 

 Vertical range from 2000 feet up to 11,500 feet; zonal range low 

 Transition to Arctic-Alpine. (See map, fig. CC.) 



Total number of specimens examined, 568, from the following 

 localities in California, trinity county: head Grizzly Creek (6000 

 feet), 18; head Bear Creek (6400 feet), 10. siskiyou county: South 

 Fork Salmon River (5000 feet), 18; Saloon Creek Divide (6850 feet), 

 1; Jackson Lake (5900 feet), 10; Sisson (3600 feet), 4; Mount Shasta 

 (7000 feet), 9; head Rush Creek (6400 feet), 10; Castle Lake (5434 

 feet), 2; Goose Nest Mountains, 1 (Biol. Surv.). shasta county: 

 Warner Creek, south slope Lassen Peak (5500 feet), 1 (Biol. Surv.) ; 

 Lassen Peak (Hudsonian east side), 15 (Biol. Surv.). plumas 

 COUNTY: Twenty miles s.w. Quincy (5000 feet), 2 (Biol. Surv.); 

 Grizzly Mountains (4100 feet), 2 (Biol. Surv.) ; Sierra Valley (5100 

 feet), 2 (Biol. Surv.). Nevada county: Independence Lake (7000 

 feet), 3. PLACER COUNTY: Blue Caiion (4700-5000 feet), 2; Cisco 

 (6000 feet), 6. alpine county: below Hope Valley (6800 feet), 2 

 (Biol. Surv.). MONO county: Farrington's Ranch near Mono Lake 

 (6800 feet), 1; Walker Lake (8000 feet), 1; one mile south Williams 

 Butte (6900 feet), 1; Warren Fork of Leevining Creek (9200 feet), 

 8; McCloud Camp, Cottonwood Creek, White Mountains (9200 feet), 

 1 ; McAfee Meadow, White Mountains (11,500 feet), 4; Big Prospector 

 Meadow, White Mountains (10,200 feet), 4; Poison Creek, White 

 Mountains (9000 feet), 2. tuolumne county: Tuolumne Meadows 

 (8600 feet), 6 ; Lyell Canon (10,000 feet), 6 ; head Lyell Cafion (9300- 

 10,700 feet), 10; Glen Aulin, Tuolumne River (7700 feet), 5; Ten 

 Lakes, Yosemite Park (9200 feet), 1; Aspen Valley (6400 feet), 1. 

 MARIPOSA COUNTY: Gcutrj^'s, Big Oak Flat Road (5800 feet), 3; 

 Yosemite Valley floor (4000 feet), 4; El Portal (2000 feet), 1; 

 Yosemite, Yosemite Valley (4000 feet), 3; Power House Meadows 

 (4000 feet), 3; Yosemite Creek (4000 feet), 3; Mount Hoffmann 

 (10,000 feet), 5; Porcupine Flat (8100 feet), 14; Merced Grove Big 

 Trees (5400-5500 feet), 15; Chinquapin (6200-6400 feet), 9; Crane 

 Flat (6300 feet), 2; Mono Meadow (7300 feet), 8; East Fork Indian 



