Value assigned to Crotalus simus, becaus Crotalus durissus culminatus (KLAUBER 1952) and Crotalus durissus tzabcan (KLAUBER 1952) have been re-assigned to C. simus by CAMPBELL & LAMAR 2004 (Source: Uetz, P., Freed, P. & Jirí Hošek (eds.), The Reptile Database).