Here are a few of the many mojave rattlesnakes, Crotalus scutulatus, I found in a 3 day period in August, 2009. The species has an incredible amount of variation throughout its range, and these individuals are no exception. The 4 hour drive to this location shows quite a bit of difference between the light greenish scutulatus I see around Phoenix.
It’s also worth mentioning that the scutulatus from Cochise county have more toxic venom than they would elsewhere. I am not sure why this is, but I’m as careful as ever when handling these guys.