1903.] NATURAL SCIENXES OF PHILADELPHIA. 31 



from Pecos represents both forms, so that at least C. haileyi must be 

 regarded as a subspecies. 

 Crotaphytes wislizenii B. and G. 



One obtained on the plain, May 6. This species is regarded by Dr. 

 Merriam as typical of the Lower Sonoran, but also ranging a certain 

 distance into the Upper Sonoran belt. It has been obtained in the 

 vicinity of Pecos, Tex., but not farther east. 

 TJta stansburyana B. and G. 



A large number seciu-ed in the country about Alamogordo show con- 

 siderable variation in color, but the relationship of the species and its 

 possible races is too involved for present consideration. 

 Holbrookia texana Troschel. 



This species was common in Dry Caiion. It is a characteristic form 

 of the Lower Sonoran of central Texas, and has been obtained by Prof. 

 Cope as far west as Lake Valley, N. M., which seems to mark the west- 

 ern limit of its range. Mr. Brown's Pecos collection contains several of 

 this species. 



Sceloporus torquatus poinsettii B. and G. 



One adult. May 10. 



This is a common species in central Texas, and has been recorded by 

 Cope from southeastern Arizona. Even if the localities on these speci- 

 mens are correct, it would seem to be decidedly an eastern species. 



Mr. Brown obtained one from the vicinity of Pecos, Tex. 

 Sceloporus clarkii B. and G. 



One young individual secured near Alamogordo, May 24. 



This form is closely related to S. magister, but according to Dr. Stej- 

 neger is restricted to southeastern Arizona (Upper Sonoran), while the 

 latter is characteristic of the Lower Sonoran deserts north to Utah and 

 Nevada. This specimen represents the farthest point east at which the 

 species has been recorded, so far as I am aware, though Prof. Cockerell 

 has sent one to the U. S. National Museum from Las Cruces, N. M. 

 Four specimens are in "Sir. Brown's Pecos collection. 

 Sceloporus consobrinus B. and G. 



This lizard was common in Dry Canon as well as on the desert. It is 

 apparently the form so identified by Cope, l3ut probably not the one so 

 named by Stejneger in the report on reptiles collected on the San Fran- 

 cisco Moimtain survey. One specimen from HighroUs, Saci'amento 

 Mountains, in the Transition belt, is doubtless referable to the latter. 

 It is darker and more heavily built than those from the desert. The 

 material in the Academy collection has not sufficiently accurate data as 



