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Species found: 10
- Crotalus helleri MEEK, 1905
- Crotalus lutosus KLAUBER, 1930
- Crotalus oreganus HOLBROOK, 1840
- Crotalus viridis (RAFINESQUE, 1818)
- Micrurus helleri SCHMIDT & SCHMIDT, 1925
- Micrurus lemniscatus (LINNAEUS, 1758)
- Panaspis helleri (LOVERIDGE, 1932)
- Pseudalsophis occidentalis (VAN DENBURGH, 1912)
- Rhabdophis helleri (SCHMIDT, 1925)
- Rhabdophis subminiatus (SCHLEGEL, 1837)