432 CALIFORNIA ACADEMY OF SCIENCES [Proc. 47H Ser. 
EXPLANATION OF PLATE XVII 
Crotalus molossus Baird and Girard: BLacK-TAILED RATTLESNAKE—Photo- 
graph from alcoholic specimen (No. 34738) collected in Ramsey Canyon, 
Huachuca Mountains, Arizona, July, 1912. 
