184 
University of California Publications in Zoology [Vol. 27 
Measurements of Adult Specimens of Bufo canorus from Yosemite National 
Park, California 
M.V.Z. 
No. 
Sex 
Locality 
Date 
Head-and-body 
length 
Length of head 1 1 
Width of head 
o 
Interorbital 
| space 
Forearm 
Hand 
3 
g 
Tibia 
Tarsus 
Whole foot 
5754 
9 
Lyell Canon, 11,000 ft 
July 16, 1915 
59.0 
16.0 
21.3 
8.0 
3.0 
15.0 
15.0 
21.0 
20.4 
12.0 
36 
57441 
9 
Porcupine Flat, 8100 ft 
July 1, 1915 
68.1 
17.5 
25.4 
8.2 
3.7 
15.8 
17.0 
26.7 
24.0 
14.5 
40 
5736 
9 
Porcupine Flat, 8100 ft 
July 1, 1915 
69.5 
19.0 
23.7 
7.5 
3.8 
17.0 
18.0 
28.0 
23.8 
14.7 
40 
7185 
9 
Tamarack Flat, 6700 ft 
May 25, 1919 
69.5 
19.0 
24.0 
8.0 
2.5 
17.2 
13.4 
26.0 
24.8 
15.0 
40 
5759 
9 
1 mi. e. Porcupine Flat, 
8100 ft 
June 28, 1915 
71.0 
18.0 
26.5 
8.0 
20.0 
17.0 
27.0 
24.0 
16.4 
44 
5760 
d 
Lyell Canon, 11,000 ft 
July 16, 1915 
51.4 
14.5 
18.6 
7.5 
3.1 
15.0 
12.8 
19.6 
19.0 
12.5 
34 
5726 
d 
So. side Ragged Peak, 
10,000 ft 
July 9, 1915 
52.3 
15.0 
19.0 
7.2 
3.7 
13.7 
13.1 
19.4 
19.0 
12.3 
33 
5750 
d 
Lyell Canon, 11,000 ft 
July 16, 1915 
53.6 
15.3 
20.0 
6.7 
4.3 
14.0 
14.0 
23.5 
19.9 
13.0 
37 
5748 
d 
Lyell Canon, 11,000 ft 
July 16, 1915 
55.0 
16.0 
20.4 
8.0 
3.4 
15.4 
12.3 
22.0 
19.8 
13.0 
37 
5737 
d 
1 mi. w. Ragged Peak, 
9700 ft 
July 8, 1915 
59.0 
15.4 
20.3 
7.5 
3.4 
15.2 
13.6 
22.5 
20.7 
13.0 
36 
1 Type. 
Remarks on sexual dimorphism. — Sexual dimorphism and dichrom- 
atism is more marked in this species than in any other California 
salientian. The male, besides being smaller than the female, has 
fewer and smaller warts, the parotoid glands are reduced, and the 
body coloration is plain olive green marked with small scattered dots 
of black each rimmed with white. The female has low rounded warts 
of larger size than those in the male, her body coloration is brownish 
but this is largely obscured by the large white-rimmed black patches 
which mark the location of the warts. This dichromatism prevails 
at least from May until September, and presumably continues through- 
out the year. 
Range. — This distinct species, discovered in 1915, is confined to the 
higher altitudes (above 6500 feet) in the central Sierra Nevada of 
California. All the stations of record to date are in Yosemite National 
Park. On the west canorus has been collected at Tamarack Plat, alti- 
tude 6700 feet, on the Big Oak Flat Road, and near Peregoy Meadow, 
7500 feet, on the road between Chinquapin and Glacier Point. The 
easternmost locality of record is Tioga Lake, 10,000 feet ; the highest 
station is in the head of Lyell Canon at 11,000 feet. The life-zones 
represented are Canadian and Hudsonian. The territory north and 
south of the Yosemite region has not been explored sufficiently to 
prove whether canorus occurs beyond the Park boundaries. At Lake 
Tahoe Bufo boreas boreas is found; in the vicinity of Mount Whitney 
