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.
29-1923