LITERATURE CITED

DIXON, J. R.

1957. Geographic variation and distribution of the genus _Tomodactylus_ in Mexico. Texas Jour. Sci., 9:379-409, December.

DUELLMAN, W. E.

1958. A review of the frogs of the genus Syrrhophus in western Mexico. Occas. Papers Mus. Zool. Univ.

Michigan, 594:1-15, June 6.

1961. The amphibians and reptiles of Michoacan, Mexico. Univ.

Kansas Publ. Mus. Nat. Hist., 15:1-148, December 20.

FIRSCHEIN, I. L.

1954. Definition of some little understood members of the leptodactylid genus _Syrrhophus_, with a description of a new species. Copeia, 1:48-58, February 19.

GALLARDO, J. M.

1965. A proposito de los Leptodactylidae (Amphibia Anura).

Papeis Avulsos, 17:77-87, January 30.

GORHAM, S. W.

1963. The comparative number of species of amphibians in Canada and other countries. III. Summary of species of anurans. Canadian Field-Nat., 77:13-48, March.

GRIFFITHS, I.

1959. The phylogeny of Sminthillus limbatus and the status of the Brachycephalidae (Amphibia Salientia). Proc. Zool.

Soc. London, 132:457-87, May.

KELLOGG, R.

1932. Mexican tailless amphibians in the United States National Museum. Bull. U. S. Natl. Mus., 160:224 pp., March 31.

LLOYD, J. J.

1963. Tectonic history of the south Central-American orogen, _in_ Childs and Beebe eds., Backbone of the Americas.

Amer. a.s.soc. Petroleum Geol., pp. 88-100.

LYNCH, J. D.

1965. A review of the eleutherodactylid frog genus _Microbatrachylus_ (Leptodactylidae). Nat. Hist. Misc., 182:1-12, December 15.

MYERS, G. S.

1962. The American leptodactylid frog genus _Eleutherodactylus_, _Hylodes_ (= _Elosia_), and _Caudiverbera_ (= _Calytocephalus_). Copeia, 1:195-202, April 11.

n.o.bLE, G. K.

1925. An outline of the relation of the ontogeny to phylogeny within the Amphibia. I. Amer. Mus. Nov., 165:1-17, April 16.

PIATT, J.

1934. The systematic status of Eleutherodactylus latrans (Cope). Amer. Midl. Nat., 15:89-91, February 15.

SMITH, H. M. and TAYLOR, E. H.

1948. An annotated checklist and key to the Amphibia of Mexico. Bull. U. S. Natl. Mus., 194:1-118. June 7.

TAYLOR, E. H.

1952. A review of the frogs and toads of Costa Rica. Univ.

Kansas Sci. Bull., 35:577-942, July 1.

ZWEIFEL, R. G.

1956. A survey of the frogs of the _augusti_ group, genus _Eleutherodactylus_. Amer. Mus. Novitates, 1813:1-35, December 23.

_Transmitted July 11, 1967._

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