| | | PAGE | | Introduction | 305 | | Methods and Terminology | 305 | | Acknowledgments | 308 | | Paleontology | 308 | | Speciation | 311 | | Subgeneric variation | 312 | | Specific variation in the subgenus Proechimys | 314 | | Subspecific variation in the subgenus Proechimys | 317 | | Specific variation in the subgenus Trinomys | 320 | | Subspecific variation in the subgenus Trinomys | 322 | | Taxonomic Characters | 323 | | Size and proportions of external parts | 323 | | Pelage | 324 | | Skull | 326 | | Incisive foramen | 326 | | Teeth | 327 | | Habits | 330 | | Changes with Age | 331 | | Genus Proechimys | 333 | | Artificial Key to Subgenera and Species | 334 | | Subgenus Proechimys | 338 | | Proechimys goeldii | 338 | | | Proechimys goeldii steerei | 338 | | | Proechimys goeldii goeldii | 340 | | Proechimys semispinosus | 342 | | | Proechimys semispinosus liminalis | 343 | | | Proechimys semispinosus amphichoricus | Proechimys dimidiatus (GÜnther). Fig. 1.Proechimys dimidiatus (GÜnther). Live female on left and male on right. × ½. From Tingua, Nova IguassÚ, Rio de Janeiro, Brazil. Photographed in spring (August or September) of 1942 by author.
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