Cope, 1869 "1868" : Sixth Contribution to the Herpetology of Tropical America. Proceedings of the Academy of Natural Sciences of Philadelphia, vol. 20, p. 305-313 (texte intégral).
Dunn & Bailey, 1939 : Snakes from the uplands of the Canal Zone and of Darien. Bulletin of the Museum of Comparative Zoology at Harvard College, vol. 86, no 1, p. 1-22 (texte intégral).