﻿13. PHRYNOSOMA 373 



With few exceptions, specimens from the mountains 

 and plateau region of Arizona conform to Dr. Stejneger's 

 characterization of P. hernandesi as regards the cephalic 

 horns. Still exceptions do occur. Thus, in a series of 31 

 specimens collected in a single locality near the top of 

 Mount Lemmon in the Catalina Mountains, a single indi- 

 vidual has horns as in P. d. omatissimum, while the others 

 are typical P. d. hernandesi. Such individual variation 

 occurs elsewhere, even as far south as the Huachuca Moun- 

 tains. It even is possible that the type specimen of P. 

 omatissimum is such an individual, for Girard stated that 

 it came from the mountainous region. These facts led us 

 to regard P. omatissimum as a synonym of P. hernandesi, 

 and to admit only the latter name to our list of Arizona 

 species (1913). 



However, Dr. Stejneger had 10 adults from San Fran- 

 cisco Mountain and four from the Little Colorado and 

 Painted deserts. There can be little doubt, therefore, that 

 the differences he found in these two series of specimens 

 were not due to individual variations, but really characterize 

 two kinds of horned-toads. Those from San Francisco 

 Mountain seem to be properly identified with Girard's T. 

 hernandesi, but because its characters are not constant this 

 form must be regarded as a subspecies, P. douglassii hernan- 

 desi. That we should use the name P. d. omatissimum for 

 the specimens from the Little Colorado and Painted des- 

 erts may be admitted, since these specimens from north- 

 eastern Arizona, in which the occipital horns are erect, are 

 too numerous to be regarded as mere individual variations. 



In Utah specimens the horns usually are erect. Some- 

 times they are as little so as in typical specimens of P. d. 

 hernandesi, and the temporal horns may be as large and as 

 red as in that subspecies. These differences occur in a 

 large series of specimens from a single locality — Salt Lake 



