1911] Bryant: Horned Lizards of California and Nevada 35 
beetles and flies seem to be eaten with relish. Even a large 
Jerusalem cricket does not daunt one of these lizards, for it 
seizes it by the head and, not being able to swallow it directly, 
either rubs it to pieces on the earth or works itself around it 
much as a snake does. A few drops of milk placed in the cage 
seemed to be enjoyed by old and young alike. 
DISTRIBUTION 
Dr. Van Denburgh (1894) placed the horned lizards inhabit- 
ing central California in a distinct species, under the name of 
Phrynosoma frontalis, basing his division on the character of the 
head seales. In a later work (Van Denburgh, 1897) the same 
division is made, using the specific name frontale. In this work 
he suggests that an intergradation between the two species P. 
blainvillet and P. frontale may take place in Santa Barbara or 
Ventura counties. The evidence at hand would seem to show 
that this intergradation takes place in Los Angeles County. <All 
Santa Barbara and Ventura County specimens examined have 
equal sized, ridged and granulated head plates, showing them to 
be P. frontale and all from San Bernardino, Riverside, Orange 
and San Diego counties have smooth, convex head plates, the 
centrally located ones being the largest, characters of P. blain- 
villei, whereas specimens from Los Angeles County show char- 
acteristics of both, the head plates being unequal in size and 
showing a tendency to be ridged and granulated. The fact that 
there is an intergradation in a rather well defined loeality, tends 
to prove that the two species are merely geographical subspecies. 
All of the other species of horned lizards, at least in the 
United States, have well-defined characters. Since these two 
forms, P. blainvillei and P. frontale, are separated by such sub- 
ordinate characters and show an intergradation, they have been 
reduced to subspecifie rank. Further study may show that the 
intergrades have enough distinet characters and occupy such a 
definite locality that they too can be deseribed as subspecies. 
Sufficient material is not at hand to justify such a division here. 
P. blainvillet blainvillei occurs only on the coastal slope be- 
tween San Diego and Pasadena. It is especially common in the 
valleys at the base of the San Gabriel, San Bernardino and San 
