Oc. Papers, Cau. Acap. Scr., VoL. X [Van Denpurcu Prare 104 
Fic. 1. Crotalus mitchellii, Bleached Rattlesnake 
Section of skin of specimen collected at San Jose del Cabo, Lower California, Mexico, 
Fic. 2. Crotalus cerastes, Horned Rattlesnake 
Section of skin of specimen from the Mohave Desert, California 
