264 University of California Fublicaiions in Zoology [Vol. 21 



the party halted there for a day. After leaving the river, they fol- 

 lowed the Oregon trail through pine forests, but finding that tliis 

 wagon route inclined too much to the westward, they struck oft' 

 northeastward across a rocky sagebrush flat, reaching Wright Lake 

 (^ Clear Lake) on August 11, and Rhett Lake the following day. 

 Their surveying and exploring following that date was carried on 

 in the state of Oregon. As other specimens from this general area 

 (west of Pit River between Fall River Mills and Lookout) have been 

 found on comparison to be intergrades, and since the type specimen 

 is so damaged that accurate identification is impossible, the writer 

 concurs with Bailey (1900, p. 28) in leaving Arvicola longirostris 

 in the synonymy of Microtiis montami'S. 



Microtus montanus yosemite Grinnell 

 Yosemite Meadow Mouse 



Microtus montanus, of authors, part. 



Microtus dutoheri, Bailey (1900, p. 32), part. Head of San Joaquin 



River; Mammoth; Pine City. 

 Microtus montanus yosemite Grinnell (1914, pp. 207-208). 



Type specimen. — Female adult ; no. 12978, Mus. Vert. Zool. ; 

 Yosemite Valley, 4000 feet altitude, Mariposa County, California; 

 May 27, 1911 ; collected by J. and H. W. Grinnell ; original no. 675. 



Range. — Sierra Nevada and Great Basin regions of eastern Cali- 

 fornia from head of San Joaquin River, in Fresno County, north to 

 Goose Lake, Modoc County, west to vicinity of Cassel, Shasta County, 

 and east across the Nevada line. Vertical range from 3000 feet up 

 to 10,350 feet; zonal range Transition to Hudsonian. (See map, 

 fig. Y.) 



Total number of specimens examined (in Mus. Vert. Zool. unless 

 indicated otherwise), 228, from the following localities in California. 

 Modoc County: Goose Lake (5150 feet), 7 (coll. Biol. Surv.) ; Davis 

 Creek, Goose Lake, 1 (coll. Biol. Surv.) ; Adin, 2 (coll. Biol. Surv.) ; 

 Sugar Hill (5000 feet), 1 ; Goose Lake Meadows near Sugar Hill (4800 

 feet), 3. Shasta County: twelve mi. east of Burney (4300 feet), 1 

 (coll. Biol. Surv.); Cassel (3000 feet), 1 (coll. Biol. Surv.); Lassen 

 Peak, 1 (coll. Biol. Surv.). Sierra County: Weber Lake (7300 feet), 

 4 (coll. Biol. Surv.). Placer County: Summit, 1 (coll. Biol. Surv.) ; 

 Donner (7500 feet), 7 (coll. Biol. Surv.); Cisco (6000 feet), 7. 

 Plumas County: Beckwith, Sierra Valley (5000 feet), 14 (coll. Biol. 

 Surv., 13; Mus. Vert. Zool., 1); eight mi. northwest of Greenville 

 (4500 feet), 3 (coll. Biol. Surv.) ; Quincy (3400 feet), 2 (coll. Biol. 

 Surv.); Mohawk (4600 feet), 3 (coH. Biol. Surv.); Spring Garden 

 Ranch, Grizzly Mts. (4100 feet), 4 (coll. Biol. Surv.) ; Buck's Ranch 

 (5100 feet), 1 (coll. Biol. Surv.) ; Prattville (4300 feet), 2 (coll. Biol. 



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