align="right">Leptodactylus

  Constrictions at waist (Fig. 5); sternum cartilaginous, no bony style 3 3. Few (less than six), if any, supernumerary tubercles on plantar surface Eleutherodactylus   Many (more than 8) supernumerary tubercles on plantar surfaces 4 4. Terminal, transverse groove across tip of digits, especially outer two fingers, digits expanded or not; small frogs (18 to 40 mm.) 5   Tips of digits lacking transverse groove; digits unexpanded; medium-sized to large frogs (37 to 94 mm.) Hylactophryne 5. Lumbo-inguinal gland compact, oval Tomodactylus   Lumbo-inguinal or inguinal gland absent or diffuse and irregular in outline Syrrhophus

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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. Assoc. 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.

Noble, 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