650 



OPHIDIA 



CHAP. XIII 



luaikiiigs on the body form a handsome pattern of rhombs with 

 lighter centres and yellowish edges. This is the largest species 

 of liattle-Snake, reaching a length of 8 feet. 



C. conjluentus has broader, transversely striated, supra-ocular 



CD.g.p. 



Fig. 181. — Crotahis durissus s. adamantcus (Rattle-Snake), x \. 



shields. The specific name refers to the continuous series of 

 large brown or red rhomboidal spots on the back. 



C. terrific'us ranges from Arizona to Argentina, and is the 

 only .species of Rattle -Snake in South America. It differs 

 from the others by having a pair of prefrontal shields behind 

 the pair of internasals. 



