2 University of California Publications in Zoology [Vou.9 
PAGE 
Phrynosoma blainvillei frontale (Van Denburgh) Bryant. 
Habits 40 
Distribution, list of loealiti 41 
Table. .of smeastirereriiay oooc isk octal csee eect ce ee ee oe See 43 
Phrynosoma platyrhinos Girard. 
External .charactveristies: -...2 ecco ceccsecccecceeecee eee paste seee eee eee 44 
Osteology osteo : 46 
Habits 47 
Distrib whos Wists Of Wo Calabi e si ecesesreecc nce cee ees nee eee eee 48 
Table of measurements : ss = 00 
Anota. allow) xon55 0 ie fos cook cnn secd ease ceewiencnucconton he tse sneer eee eee 51 
Anota maccalli Hallowell. 
Bixternal! Chara teristyesiyccscee occscceecre- =o ae zane ener se ee eee 54 
BCC OL 0 ye cesar ne eee a ee eee ae 56 
TA DS. © soe 2s eee eo earn ses Vereen 58 
Distribution. Liste otele call yt sys ce eee eee eee eee ee 59 
able of “measurements: ese es cence acca ecco cee an ne 60 
f= ECF 0 F:)) oh aa Eee eee a eee ero pee een coe Bee = Cece Soe OEECEE EEN ce SEECeRe ee ericbee Nae! 61 
Bibliography  22c:-.-cssccessmcerecesnaceesrosee epee epechats sedode cee SwSS-Sanicesrenee aera 63 
INTRODUCTION 
The paper here presented is the result of preliminary study 
of Phrynosoma blainvillei carried on at Pomona College during 
1908 and a further study of the five species of Phrynosoma known 
to inhabit the states of California and Nevada, conducted at the 
University of California during the college year 1909-1910. 
The material upon which this study is based consists of a 
good working collection of some sixty alcoholic specimens, rep- 
resenting ten of the known species of Phrynosoma, belonging to 
the Zoological Department of the University of California, and 
in addition a collection of over one hundred and fifty specimens, 
representing four of the species under consideration, belonging 
to the Museum of Vertebrate Zoology of the University of Cali- 
fornia. A cursory examination, which threw new light on the 
subject, was made of the collection in Leland Stanford Junior 
University. In all some three hundred specimens were examined. 
Observation of a large number of live specimens in the field and 
in the laboratory furnished the foundation for most of the habit 
notes. 
To Professor C. A. Kofoid, under whose direction the work 
was done, Professor J. C. Merriam, Professor H. B. Torrey, and 
