CROTAPHYTUS COLLARIS. 83 



General Remarks. This animal was first described by Say, in Long's 

 Expedition to the Rocky Mountains, who calls it Agama coUaris. Not being 

 able to refer this animal to any one established genera, I have proposed a new 

 genus, Crotaphytus. 



Never having seen the living animal, the colours of the accompanying plate 

 were taken from a specimen preserved in alcohol, and consequently cannot be 

 full)'' relied on. 



