Zweifel, RG. and Norris, K.S. Contributions to the herpetology of Sonora, Mexico: miscellaneous collecting notes. Amer Midi Nat 1954; 54, 230-49. --- Hardy, RM. and McDiarmid, RW. The amphibians and reptiles of Sinaloa, Mexico. Univ Kan Pub Mus Nat Hist 1969; 18, 39-352