164 
University of California Publications in Zoology [Vol. 27 
tympanic membrane oval, smaller than orbit, horizontal axis about 
four-fifths vertical axis; parotoid glands twice as long as broad, 
descending on shoulders, length about 1% times length of orbit; 
angle of jaw below tympanic membrane ; head one-third wider than 
long; gular fold slight; forearm longer than hand; inner finger 
stoutest; two flattened metacarpal tubercles, both large but inner 
smaller than outer; subarticular tubercles low; fingers in order of 
decreasing length, 3, 1, 2, 4 ; back very flat ; hind limb stouter than 
fore limb ; femur about equal to tibia in length ; tarsus about two- 
fifths length of whole foot; foot relatively short; inner metatarsal 
tubercle large and rounded, outer one small and flattened ; toes in 
order of decreasing length, 4, 3, 5, 2, 1 ; web deeply scalloped, margin 
between third and fourth toes opposite first phalanx of latter. 
Outline of lower jaw broadly oval in adults, more acute in young ; 
tongue thin, oval in outline, width about half that of mouth, attached 
by less than half its length to floor of mouth ; internal nares pyriform, 
located far forward in anterior part of mouth. 
Body everywhere nearly smooth, skin leathery in texture; a few 
low warts on eyelids and interorbital region ; parotoid glands smooth- 
surfaced ; several large warts posterior to mouth in line with commis- 
sure; few very small, low, scattered warts on back; sides of body 
areolated; ventral surface smooth anteriorly, roughened from throat 
region posteriorly; few warts on upper arm and dorsal surface of 
hand; one large raised gland on anterodorsal surface of femur and 
several on exposed surface of tibia. 
General coloration on upper and lateral surfaces of body and 
limbs, grayish or brownish green of light or dark shade ; small warts 
orange, sometimes rimmed with dusky; ventral surface dingy white; 
fingers and toes tipped with dark reddish brown or blackish; iris of 
eye light or dark metallic yellow, prominently veined with red ; pupil 
horizontally oval, black (description of coloration adapted from Dick- 
erson, 1906, p. 106). 
Measurements of Adult Specimens of Bufo alvarius from California and 
Arizona 
M.V.Z. 
No. 
Sex 
Locality 
Date 
Head-and-body 
length 
Length of head j j 
j Width of head jj 
j Orbit 
| Interorbital 
| . space 
Forearm 
Hand 
Femur 
Tibia ^ 
Tarsus 
j Whole foot 
3738 
9 
Holtville, Imperial Co., 
Calif 
June 2, 1912 
117 
33 
45 0 
13.0 
9.0 
30.2 
23.0 
40.2 
40.7 
28.5 
63 
8264 
9 
Mohave [=Ft. Mohave], 
Ariz 
[1861] 
129.5 
40.8 
58.0 
16.0 
12.0 
35.0 
32.0 
48.0 
48.5 
33.5 
77 
7703 
9? 
6 mi. n. Tucson, Pima 
Co., Ariz 
Sept. 7, 1919 
130 
35 
46.0 
13.2 
10.0 
31.0 
24.5 
49.0 
44.0 
29.0 
70 
3736 
& 
Meloland, Imperial Co., 
Calif 
June 18, 1912 
120 
34 
45.0 
13.0 
10.0 
32.0 
27.5 
46.0 
45.0 
29.0 
66 
8265 
cT 
Mohave [=Ft. Mohave], 
Ariz 
[1861] 
124 
40.4 
52.5 
15.5 
11.0 37.0 
27.0 
57.0 
4S.0 30.5 
76 
8179 
d 71 
Tolladay’s Well, Mari- 
copa Co., Ariz 
July 16, 1921 
132 
41 
50.0 
17.0 11. Oj 
o 
23 
o 
50.3 
48.5 33.0 
76 
