BioStor
 | The snakes of the Galapagos Islands John Van Denburgh (1912) Proceedings of the California Academy of Sciences 1: 323-374 |
 | Holotype specimens of reptiles and amphibians in the Collection of the California Academy of Sciences J R Slevin and A E Leviton (1956) Proc. Calif. Acad. Sci. (4) 28: 529-560 |