Part 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

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.