262 
University of California Publications in Zoology [Yol. 27 
limiting factor with boylii. That the cold mountain stream type of 
habitat is not closed to the use of an amphibian that is specially suited 
for life in such an environment is indicated in the life-history of 
Ascaphus truei (see Gaige, 1920). Boylii is found in the slower 
moving waters in the Upper Sonoran Zone, it is absent from the tor- 
rential streams in the Transition and Canadian zones, and it reappears 
again, in modified form (subspecies sierrae), at the higher altitudes 
in the slower streams and in the lakes of the Hudsonian Zone. 
Eana boylii muscosa Camp. Sierra Madre Yellow-legged Frog 
(PI. 2, fig. 4; pi. 12, fig. 36) 
Bana pretiosa, Yarrow and Henshaw (1878, p. 210), part. Locality record. 
Bana pretiosa, Yarrow (1883, pp. 25, 186), part. Locality records. 
Bana boylii muscosa Camp. (1917&, pp. 118-120). Original description, 
type from Arroyo Seco Canon, altitude about 1300 feet, near Pasadena, 
California. 
Bana boylii muscosa, Grinnell and Camp (1917, pp. 147-148, fig. 5). Range. 
Bana boylii muscosa, Stejneger and Barbour (1917, p. 36; 1923, p. 34). 
General range. 
Diagnosis. — As for Bana boylii boylii (which see), but without 
light patch across upper eyelids in front of dark patches (except in 
young) ; dorsal ground color usually lighter, and tips of toes more 
expanded. 
Comparisons. — See Bana boylii boylii. 
Measurements of Adult Specimens of Bana boylii muscosa from San Gabriel 
Mountains, Los Angeles County, California 
M.V.Z. 
No. 
Sex 
Locality 
Date 
Head-and-body 1 
length 
Length of head 
Width of head 
£ 
O 
Interorbital 
space 
Forearm 
Hand 
Femur 
Tibia 
Tarsus 
o 
o 
’o 
£ 
4856 
9 
Mt. Wilson trail below 
Half Way House 
July 22, 1913 
54.0 
16.8 
20 0 
6.8 
3.5 
12.0 
13.7 
26 0 
29.5 
13.3 
42 
4388 
9 
Little Santa Anita Canon, 
2800 ft 
June 23, 1909 
57.0 
18.7 
21.0 
7.0 
4.0 
13.2 
14.5 
28.0 
30.6 
14.2 
45 
4383 
9 
West Fork San Gabriel 
River, 3000 ft 
May 1, 1909 
62.5 
19.7 
24.0 
7.8 
4.6 
16.0 
16.0 
35.0 
34.0 
16.8 
51 
6905 
9 
Santa Anita Canon at The 
Falls 
May 5, 1918 
66.5 
20.5 
25.0 
8.0 
5.0 
17.0 
17.5 
39.0 
37.5 
18.0 
54 
4381 
9 
West Fork San Gabriel 
River, 3000 ft 
May 1, 1909 
67.6 
21.5 
26.0 
8.2 
4.0 
16.8 
16.4 
36.0 
37.0 
18.3 
56 
4855 
c? 
Mt. Wilson trail below 
Half Way House 
July 22, 1913 
48.0 
16.0 
17.8 
7.0 
4.0 
12.4 
12.7 
23.6 
26.7 
13.0 
40 
4387 
o’ 
West Fork San Gabriel 
River, 3000 ft 
May 1, 1909 
50.2 
15.5 
18.0 
7.4 
4.0 
13.0 
12.7 
27.5 
29.0 
14.0 
42 
4374 
c? 
Little Santa Anita Canon. 
Apr. 5, 1908 
55.5 
18.5 
19.8 
6.1 
5.0 
15.0 
15.0 
29.2 
31.2 
14.0 
47 
6915 
c? 
In canon 1§ mi. n. Sierra 
Madre 
May 30, 1918 
55.8 
18.5 
20 6 
8.8 
4.0 
15.2 
14 0 
29.5 
32.0 
14.2 
48 
770 
o’ 
Arroyo Seco near Pasa- 
dena 
Aug. 3, 1903 
56 3 
18.6 
21.0 
7.6 
4.7 
14.0 
13.0 
30.6 
30.8 
15.4 
45 
