(AMNH); Ernest E. Williams, Museum of Comparative Zoology (MCZ); L. Forcart, Naturhistorisches Museum, Basel; L. D. Brongersma, Rijksmuseum van Natuurlijke Historie, Leiden; J. Eiselt, Naturhistorisches Museum, Wien; Fredrico Medem, Instituto Ciencias Naturales, Bogota (ICNB); Alan E. Leviton, California Academy of Sciences; Werner Ladiges, Zoologisches Staatsinstitut und Museum, Hamburg; Doris M. Cochran, United States National Museum; Jean Guibe, Museum National de Histoire Naturelle, Paris; and Heinz Wermuth, formerly of Zoologisches Museum Berlin, for allowing us to examine valuable material from Mexico, Central America, and South America. We greatly appreciate the assistance of Hermano Niceforo Maria of the
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Lee et al. (1963) studied this question.