[english | 1961]
Excerpts: [... 1-2, pp. 349-357 April 27, 1961. Descriptions of Two Species of Frogs, Genus Ptychohyla Studies of American Hylid Frogs, V. BY WILLIAM E. DUELLMAN. UNIVERSITY ...... (1954:169) discussed the generic characters and pointed out that both the ventrolateral glands and horny nuptial spines were seasonal in their development, ...... of species. In both groups breeding males have large ...]
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