Crotalus vegrandis, or the Uracoan Rattlesnake, is a venomous pit viper endemic to Venezuela.
Klauber (1997) gives two maximum lengths: 636 mm for the largest measured specimen, and 684 mm as the greatest value from a report believed to be reliable.[1]
The species only occurs in its type locality of the MaturĂn Savannah, near the Uracoa Municipality within the state of Monagas.