LITERATURE CITED

AHL, E.

1934. Ueber eine sammlung von Reptilien und Amphibien aus

Mexiko, Zool. Anz., 106:184-186, April 15.

BLAIR, W. F.

1956. Call difference as an isolation mechanism in

southwestern toads (genus _Bufo_). Texas Jour. Sci.,

8:87-106, March.

DUELLMAN, W. E.

1956. The frogs of the hylid genus _Phrynohyas_ Fitzinger,

1843. Misc. Publ. Mus. Zool. Univ. Michigan, 96:1-47,

pls. 1-6, February 21.

1960. Synonymy, variation, and distribution of _Ptychohyla

leonhardschultzei_ Ahl. Studies of American Hylid Frogs,

IV. Herpetologica, 16:191-197, September 23.

1961. Descriptions of two species of frogs, genus Ptychohyla.

Studies of American Hylid Frogs, V. Univ. Kansas Publ.

Mus. Nat. Hist., 13:349-357, pl. 25, April 27.

FOUQUETTE, M. J.

1960. Isolating mechanisms in three sympatric treefrogs in the

Canal Zone. Evolution, 14:484-497, December.

KELLOGG, R.

1928. An apparently new _Hyla_ from El Salvador. Proc. Biol.

Soc. Washington, 41:123-124, June 29.

MERTENS, R.

1952. Die Amphibien und Reptilien von El Salvador.

Senckenbergischen Naturf. Gesell., 487:1-120, pls. 1-16,

December 1.

RIDGWAY, R.

1912. Color standards and color nomenclature. Washington,

D. C., 44 pp., 53 pls.

SHANNON, F. A.

1951. Notes on a herpetological collection from Oaxaca and

other localities in Mexico. Proc. U. S. Nat. Mus.,

101:465-484, May 17.

STUART, L. C.

1954. Descriptions of some new amphibians and reptiles from

Guatemala. Proc. Biol. Soc. Washington, 67:159-178,

August 5.

TANNER, W. W.

1957. Notes on a collection of amphibians and reptiles from

southern Mexico, with a description of a new _Hyla_.

Great Basin Nat., 17:52-56, July 31.

TAYLOR, E. H.

1937. New species of hylid frogs from Mexico with comments on

the rare _Hyla bistincta_ Cope. Proc. Biol. Soc.

Washington, 50:43-54, pls. 2-3, April 21.

1942. New tailless amphibia from Mexico. Univ. Kansas Sci.

Bull., 28: 67-89, May 15.

1944. A new genus and species of Mexican frogs. Univ. Kansas

Sci. Bull., 30:41-45, June 12.

1949. New or unusual Mexican amphibians. Amer. Mus. Novitates,

1437:1-21, December 7.

_Transmitted December 27, 1962._

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