1916] Grinnell_Storer: Diagnoses of Seven New Mammals 1 
Material—Fifty specimens from the Sierra Nevada in or near the 
Yosemite National Park, in Mariposa, Tuolumne and Mono counties, 
California. The various points of capture all lie within the Hudsonian 
and Alpine-Arctie zones. 
Remarks.—The extensive series of conies now available from the 
Sierra Nevada points unmistakably to intergradation between schisti- 
ceps and .albatus through the race here named muirt. Thus albatus 
should henceforth be designated trinomially. Muiri is, if anything, 
nearer to schisticeps of the Lake Tahoe region and northward than to 
albatus of the Mount Whitney region. 
The new form here characterized is named for a gifted Sierran 
naturalist, the late John Muir. 
Sylvilagus bachmani mariposae, new subspecies 
Mariposa Brush Rabbit 
Type—Male adult, skin and skull; no. 21867, Mus. Vert. Zool.; 
adenostoma association, on McCauley Trail, at 4000 feet altitude, near 
El Portal, Mariposa County, California; December 7, 1914; collected 
by J. Grinnell; original no. 2972. 
Diagnosis.—Similar to Sylvilagus bachmani bachmam, but general 
tone of coloration decidedly grayer, more black on back, ears larger, 
and cranium larger with longer and heavier rostral region; similar 
to Sylvilagus bachmani cinerascens, but grayer, especially on sides 
and ears, back with more black, general size greater, cranium with 
longer and heavier rostral region, and auditory bullae conspicuously 
smaller. 
Material.—Six adult specimens from the Upper Sonoran Zone of 
the western Sierran foothills in Mariposa County, California, 800 to 
4000 feet altitude. 
MEASUREMENTS (IN MILLIMETERS) 
No. Sex Total length Tail Hind foot Ear from crown 
21867 fot 326 30 73 80 
21868 ie) 342 27 75 80 
22928 2 340 32 al = 
22929 fof 340 25 75 80 
23619 ©) 280 25 75 75 
23620 Jb 313 32 74 74 
