LITERATURE CITED
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1934. Über eine sammlung von Reptilien und Amphibien aus Mexiko,
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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.