)c. PAPERS, CAI.. ACAD. Sci., VOL. X 



[VAN DENBURGH] 



PLATE 99 



FIG. 1. Cr'it.ilus mulrjssus, Black-tailed Rattlesnake 

 i-tion of xkin of specimen collected at Cave Creek, Maricopa County, Arizona, April, 1910. 



FIG. 2. Crotalus txsul, Red Diamond Rattlesnake 

 rtinn of skin of specimen collected at Ensenada. Lower C'allfornia. Mexico, February. 1908. 



