1 
1916 ] Camp: Subspecies of Sceloporus occidentalis 6! 
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and change in coloration of the underparts is most abrupt in the nar- 
row district lying between the Merced River and Raymond, Madera 
County. Adult males from San Emigdio and Walker Basin, in Kern 
County, are from 75 to 90 millimeters in length of body (averaging 85 
millimeters). The largest males of occidentalis from various localities 
in the Sacramento Valley and in Modoe and Humboldt counties range 
from 62 to 80 millimeters and average about 71. Those from such 
intermediate points as eastern Merced County, and Raymond, Madera 
County, are from 71 to 80 millimeters long and average about 75. 
A key that will apply invariably for all individuals of both sexes 
of the following three subspecies cannot be formulated. Females 
without blue throat patches can be referred to S. 0. occidentalis, those 
with a single throat patch to S. 0. bi-servatus (see Van Denburgh, 1897, 
p. 73), but beyond this the identification of females is best not at- 
tempted. Males (told at once by the enlarged post-anal plates) can be 
distinguished by the following key: 
A. Belly-patches separate from throat patches and divided by either a lighter 
or darker band. 
b. Chest, mid-ventral line and lower surface of hind limb very light 
in color or speckled with darker scales; blue throat patches in 
young males sometimes divided by light or dark seales; body 
length of adults 62-80 millimeters. 
Sceloporus occidentalis occidentalis Baird and Girard, 
b’. Chest, mid-ventral line and lower surface of hind limb grey or 
black in color; blue throat patch never divided; body length 
of adults 75-90 millimeters. 
Sceloporus occidentalis bi-seriatus Hallowell. 
A’. Belly-patches confluent with throat patch and not divided by a lighter or 
darker band; ventral color deep blue throughout; little or no dusky 
color on chest. 
Sceloporus occidentalis taylori Camp. 
It is desired here to describe a very distinct new subspecies of 
Sceloporus occidentalis occurring about the headwaters of the Merced 
River in the Yosemite National Park and perhaps farther south in the 
Sierra Nevada. Specimens of this brilliantly colored lizard were col- 
lected by various members of the field party from the Museum of 
Vertebrate Zoology, which participated in the Natural History Survey 
of the Yosemite region during 1914-1915. 
