| PAGE | | Introduction | 21 | | Acknowledgments | 23 | | Field Studies in the Isthmus of Tehuantepec | 23 | | Sources of Material | 24 | | Description of the Isthmus of Tehuantepec | 25 | | Physiography | 25 | | Climate | 28 | | Vegetation | 29 | | The Sierra de los Tuxtlas | 32 | | Gazetteer | 33 | | The Amphibian Fauna of the Lowlands | 37 | | Composition of the Fauna | 37 | | Ecology of the Fauna | 38 | | Distribution of the Fauna | 42 | | The Amphibian Fauna of the Foothills and Adjacent Highlands | 44 | | Establishment of Present Patterns of Distribution | 45 | | Accounts of Species | 49 | | Summary | 68 | | Literature Cited | 69 |
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