Duméril, A. M., and Bocourt, F.
1870-1909 Études sur les reptiles. Mission scientifique au Mexique et dans l'Amerique Centrale, Recherches zoologiques. Paris, Pt. 3, 1:xiv + 1012, pls. 1-77.
Dunn, E. R.
1928 A tentative key and arrangement of the American genera of Colubridae. Bull. Antivenin Inst. Amer., 2 (1):18-24.
1936 Notes on North American Leptodeira. Proc. Nat. Acad. Sci., 22 (12):689-698.
Garman, S.
1884 The North American reptiles and batrachians. Bull. Essex Inst., 16:1-46, 3 figs.
Günther, A. C. L. G.
1860 On new reptiles and fishes from Mexico. Proc. Zool. Soc. London, pp. 316-319.
1885-1902 Biologia Centrali-Americana. Reptilia and Batrachia. London, pp. xx + 1-326, pls. 1-76.