134 Bulletin of Labor atones of Denison University. [Voi.xi. 
ccc. Enlarged dorsal tubercles flat or feebly raised; 
tympanum covered with scales; occipital spines 
shorter than the transverse diameter of the eye; 
peripheral spines a single series or nearly absent; 
6-12 femoral pores; more than three sublabials 
enlarged,. ... P. platyrliynus. 
cccc. One series of peripheral spines; 7-10 femoral 
pores; only three sublabials enlarged. 
P. goodei. 
bbb. Two occipital spines not longer than the longest 
temporals, . . . . P. modestuni. 
c. Tail not longer than head. 
d. Occipital spines a little larger than the temporals. 
P. braconnieii. 
dd. Occipital spines much smaller than the temporals. 
P. taurus. 
The following probable synonyms are indicated : P. plani- 
ceps is a variety of P. cornatum. , P. brevirostris is P. douglas- 
sii., P. ornatissimum is P. douglassii., P. Solaris is P. regale. 
Sp. I. Phrynosoma Douglassii, Bell. 
Plate XVIII, Fig. 15. 
This is the common species in she mountains and upland 
mesas in northern New Mexico. 
Description : Nostril opening on the canthi rostrales; gular 
scales small, near equal in> size; a series of enlarged sublabial 
scales which are not much larger than the infralabials and are 
separated by several rows of granules. Infralabials (in a large 
specimen) 16 on a side, increasing toward the angle of the 
mouth and there ending in a large spine; sublabials 9 on a side; 
supralabials not enlarged and passing laterally into small gran- 
ular scales; head spines rather small, about equalling the trans- 
verse diameter of the orbit; four temporals, one occipital and one 
postorbital spine on a side; other head scales small and irregu- 
lar, roughened with ridges and granulations; one or two gular 
folds; tympanum not covered with scales; back covered with 
sharp, keeled, tubercular spines, which are irregularly distrib- 
