The Americas, from southern Canada to northern Argentina (McDiarmid et al., 1999).
Type-species: Crotalus horridus Linnaeus, 1758, by susequent designation of Fitzinger (1843:29). Confirmed and conserved by ICZN, 1926, Opinion 92, Smithsonian Miscellaneous Collections 73(4):339 (McDiarmid et al., 1999).
