1925] 
Storer: A Synopsis of the Amphibia of California 
205 
stage of Duges, with hind limbs developing]. The following descrip- 
tion and measurements apply to an individual collected in Palm 
Canon, Riverside County, March 26, 1923, which was only 14.7 milli- 
meters in total length.) Length of head-and-body 6.45 mm.; of tail 
7.80 mm. ; length of head-and-body contained 1.2 times in length of 
tail; tip of snout to orbit 4.8 in length of head-and-body; greatest 
width of body 1.6 in its own length; greatest height of body 1.75 in 
its own length; interorbital space 4.1 in length of head-and-body; 
spiraculum sinistral, aperture directed backward; center of aperture 
slightly behind midpoint of body ; anus dextral. Skin brownish black 
with numerous minute xanthophores (0.05 mm.) scattered over sur- 
face ; tail banded with yellow and black. 
Measurements of Adult Specimens of Hyla arenicolor from Foothill Canons 
in Vicinity of Sierra Madre, Los Angeles County, California 
M. V. Z. 
No. 
Sex 
Date 
Head-and-body 
length 
Length of head 
Width of head 
Orbit 
Interorbital 
space 
Forearm 
Hand 
Femur 
Tibia 
Tarsus 
Whole foot 
4430 1 
9 
May 
1, 1909 
40.5 
12.5 
15.2 
4.7 
3.2 
9.5 
11.8 
19.3 
23.0 
13.0 
31 
4421 
$ 
Apr. 
11, 1908 
41.0 
12.5 
15.3 
5.2 
3.0 
9.0 
12.3 
20.4 
22.0 
12.8 
31 
4426 
9 
Apr. 
25, 1908 
41.0 
12.5 
14.5 
5.5 
3.3 
9.0 
14.0 
20.3 
21.5 
12.5 
28 
4427 
9 
Apr. 
10, 1909 
41.5 
13.0 
15.0 
5.5 
3.0 
9.5 
13.5 
18.0 
21.0 
12.0 
28 
4415 
9 
Apr. 
5, 1908 
43.2 
13.1 
16.3 
5.0 
3.0 
9.6 
12.0 
21.0 
22.3 
13.3 
29 
4424 
d 
Apr. 
20, 1908 
30.0 
10.0 
11.0 
4.6 
3.0 
6.7 
9.0 
16.3 
17.3 
10.0 
24 
4417 
d 
Apr. 
5, 1908 
30.8 
10.3 
12.3 
4.1 
2.4 
7.6 
9.0 
15.0 
16.4 
9.5 
22 
4414 
d 
Apr. 
5, 1908 
31.4 
10.4 
11.7 
3.7 
2.3 
7.6 
9.0 
15.0 
17.8 
10.0 
23 
4428 1 
d 
May 
1, 1909 
32.0 
10.3 
11.3 
4.0 
2.8 
6.8 
10.0 
15.5 
16.8 
9.3 
23 
4418 
d 
Apr. 
5, 1908 
33.8 
11.3 
12.5 
4.4 
3.2 
8.0 
10.0 
15.0 
18.0 
10.0 
24 
1 W. fork San Gabriel River, 3000 ft. 
Remarks on coloration. — This Hyla possesses some power of color 
change, though the range is much shorter than in the case of Hyla 
regilla, as its colors are always some tone of gray. Individuals of 
arenicolor are at times almost white in ground color; again, the same 
animal may be very dark gray. The usual color is, however, a gray of 
medium tone, closely resembling that of the granite boulders on which 
the animals rest. Dickerson (1906, p. 123) says of examples taken at 
Tucson, Arizona, “The colour is rapidly changeable from gray or 
brown so dark that it is nearly black, through distinctly spotted 
phases, to a pinkish or grayish unspotted white.” 
The present w T riter has not seen the brownish tones in living 
California specimens, though his experience with the species in life 
has been limited. Alcoholic specimens are usually gray * occasional 
