LITERATURE CITED
Dixon, J. R.
1957. Geographic variation and distribution of the genus Tomodactylus in Mexico. Texas Journ. Sci., 9(4):379-409, 5 figs., 1 map, December.
Duellman, W. E., and Dixon, J. R.
1959. A new frog of the genus Tomodactylus from Michoacan, Mexico. Texas Journ. Sci., 11(1):78-82, 1 fig., 1 table, March.
Firschein, I. L.
1954. Definition of some little-understood members of the leptodactylid genus Syrrhophus, with a description of a new species. Copeia, 1954, 1:48-58, February 19.
Langebartel, D. A., and Shannon, F. A.
1956. A new frog (Syrrhophus) from the Sinaloan lowlands of Mexico. Herpetologica, 12(3):163-165, 2 figs., September 1.
Smith, H. M., and Taylor, E. H.
1948. An annotated checklist and key to the Amphibia of Mexico. Bull. U. S. Nat. Mus., No. 194, pp. iv + 118.
Taylor, E. H.
1940. Herpetological miscellany. Univ. Kansas Sci. Bull., 26(15):489-571, 10 pls., 7 figs., November 15.