Crotalus molossus is a venomous pitviper species found in the southwestern United States and Mexico. Four subspecies are currently recognized, including the nominate subspecies described here. This is a medium-sized species that averages 76-107 cm in length. Large specimens are usually not much more than 100 cm, although lengths of 125.0 cm, 125.7 cm and 129.5 cm have been reported. The females tend to be larger than the males. They range in color from olive greens, to yellows, to browns, all the way to black. As their name implies, one of their most distinguishing features is that despite variations capable in body color, the tail scales are entirely black.

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