20 University of California Publications in Zoology [Vou-9 
Nevada, the Mojave Desert, and the northern part of the Colo- 
rado Desert of California. There are also records from Arizona. 
The hottest and most arid parts of the deserts seem to be the 
most attractive for this lizard. The type specimen was obtained 
from the basin of Great Salt Lake. 
A single specimen of a horned lizard collected in Death 
Valley, Inyo County, California, was described by Cope (1896) 
as a new species, Anota calidiarum (Phrynosoma calidiarum). 
The type being the only specimen known, and the differences 
from P. platyrhinos being very shght, there is some doubt as to 
the validity of the species. ; 
The flat-tailed horned lizard, Anola maccalli, the other 
desert species, is rare and found only on the Colorado Desert 
of Imperial County, California, the Gila Desert, and Sonora, 
Mexico. The type specimen was taken between Vallecito and 
Camp Yuma, about 160 miles from San Diego. Van Denburgh 
(1897) gives this as the only California record of A. maccalli, 
the other three specimens belonging to the U. 8S. National 
Museum being from Fort Yuma, Arizona. Of this rare species 
there are at present in the Museum of Vertebrate Zoology of 
the University of California eight specimens, four from Mecea, 
three from Salton Lake, and one from Coyote Well. Several 
specimens of P. platyrhinos were taken at Mecea at the same 
time that Anota maccalli was collected, which would show an 
overlapping of the areas of distribution of the two species at 
this point. 
Another overlapping of areas of distribution is to be noticed 
in the ease of Phrynosoma blainvillei frontale and P. platyrhinos, 
for specimens of both species have been taken in Walker Pass, 
along the Kern River near Chimney Creek, and on the west 
slope of the divide, at an altitude of 5500 feet, in Kern County, 
by members of the Mt. Whitney Expedition of 1911 of the 
Museum of Vertebrate Zoology of the University of California. 
Doubtless the same intermingling of species takes place at other 
points in the Sierras, for, although this range of mountains 
forms the western boundary for P. platyrhinos and the eastern 
boundary for P. blainvillei frontale, it in no way forms an insur- 
mountable barrier for these lizards. 
