60 University of California Publications in Zoology — | Vou. 17 
Material—F orty-two alcoholic specimens, all but one from within 
the Yosemite National Park at the following localities: Near Peregoy 
Meadow, 7000 feet altitude (no. 57429) ; near Mono Meadow, 7300 feet 
(no. 57474) ; East Fork Indian Cafion, near B. M. 7937 feet (no. 
57282) ; vicinity of Porcupine Flat, 8100-8200 feet (nos. 57299, 57309, 
57369, 57439, 57449, 57592) ; vicinity of Ragged Peak, 9700—10,200 
feet (nos. 5721-5727, all ¢¢, 57319, 57329, 57349, 57359, 57373, 
57384) ; head of Lyell Cafion, 9700-11,000 feet (nos. 57382, 5739, 
57409, 574101, 57452, 57489, 5749-5753, all Jog, 5754-5758, all 99, 
5760¢) ; Vogelsang Lake, 10,350 feet (mos. 603592, 60449). One speci- 
men from Tioga Lake, Mono County, 10,000 feet (no. 57462). 
Bufo canorus; 9 type; all X 1 
Fig. 1. Top of head; note great width of parotoids and shape of snout. 
Fig. 2. Side of head; note extent of parotoids and steep profile of snout. 
Fig. 3. Front foot, from below; note small inner metacarpal tubercle. 
Fig. 4. Hind foot, from below; note reduced webbing and large outer meta- 
tarsal tubercle. 
Comparisons.—In profile, lack of head crests, small tympanum, and 
short legs this toad resembles Bufo boreas and its subspecies, but may 
be distinguished at once from these forms by its smaller size, enormous 
width of parotoids, slight interval between parotoids, very smooth skin, 
absence of a broad vertebral stripe, and markedly different color pat- 
tern in both sexes. In extent of webbing of hind foot the present 
species most nearly resembles B. boreas halophilus, its near neighbor 
in the southern Sierra Nevada and the San Joaquin Valley. Speci- 
mens of B. boreas boreas from Mono County, directly to the east of 
the range of canorus, have the large hind foot characteristic of the 
more northern subspecies. 
