1911] Bryant: Horned Lizards of California and Nevada 5 
The working out of a key from a complete set of specimens of 
all the species might reveal the necessary characters for a revision 
of the genus. Until this can be done, the classification used by 
most of the recent writers (Gentry, 1885; Van Denburgh, 1897; 
Ditmars, 1907), grouping all of the species under the one genus 
Phrynosoma, is best used. 
One exception, that of Anota maccalli 
(Phrynosoma maccalli), should be made. 
It is here placed by 
itself in the genus Anota, the reasons being given in their proper 
place. 
In the following table are given the recognized species and 
subspecies of the two genera with their distribution. 
A List oF THE RECOGNIZED SPECIES AND SUBSPECIES OF THE 
GENERA PHRYNOSOMA AND ANOTA 
Species 
Distribution 
1. Phrynosoma asio Cope Southwestern Mexico 
2. Phrynosoma blainvillei blainvillei Southern California 
(Gray) Bryant 
3. Phrynosoma  blainvillei frontale Central California 
(Van Denburgh) Bryant 
4. Phrynosoma boucardi Bocourt Plateau of Mexico 
5. Phrynosoma braconnieri Bocourt Southern Mexico 
6. Phrynosoma cerroense Stejneger Cerros Island, Lower California 
7. Phrynosoma ecornutum Harlan Kansas, Oklahoma, Texas, New 
Mexico and Northern Mex‘eo 
8. Phrynosoma coronatum Blainville Lower California 
9. Phrynosoma ditmarsi Stejneger Sonora, Mexico 
10. Phrynosoma douglassi douglassi Northern part of Pacifie Region 
(Bell) Stejneger 
11. Phrynosoma douglassi hernandesi Great Plains and Rocky Moun- 
(Girard) Cope tains 
12. Phrynosoma douglassi ornatissi- Painted Desert of Arizona 
mum (Girard) Cope 
13. Phrynosoma goodei Stejneger Sonora, Mex‘co 
14. Phrynosoma modestum Girard Texas, New Mexico, Utah, Ariz- 
ona and southwestern Mexico 
15, Phrynosoma orbiculare Wiegmann Plateaus of Mexico 
16. Phrynosoma platyrhinos Girard Lower Sonora and Deserts of the 
Great Basin from California to 
Utah 
17. Phrynosoma solare Gray Valleys of the Gila and Colorado 
. Phrynosoma taurus Duges 
. Anota macealli Hallowell 
rivers 
Southeastern Mexico 
Deserts of the Gila and Colorado 
rivers 
