Zoology NEW SERIES, NO. 105 Morphological Phylogeny of the Bat Genus Platyrrhinus Saussure, 1860 (Chiroptera: Phyllostomidae) with the Description of Four New Species Paul M. Velazco Division of Mammals Department of Zoology Field Museum of Natural History 1400 South Lake Shore Drive Chicago, Illinois 60605-2496 U.S.A. Department of Biological Sciences University of Illinois at Chicago Chicago, Illinois 60680-4348 U.S.A. Accepted July 22, 2005 Published November 15, 2005 Publication 1535