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<it>Wilson, Don E. (Bird and Mammal Laboratories, National Museum of Natural History, Washington, D. C. 20560) 1973. Bat faunas: a trophic comparison. Syst. Zool. 22:14–29</it>.—The bat faunas of the six zoogeographic regions are compared using taxonomic and trophic analyses. Similarity indices are calculated using the percent of total species per area for each genus and the importance of various trophic roles in the areas. Trophic role values were calculated by multiplying generic importance values by indices for the importance of applicable trophic roles for each genus and summing the values for every genus in a given region. Faunal regions are much more similar trophically than taxonomically. Although geographic patterns are discemable from taxonomic approaches, climatic patterns are more important trophically. All of the trophic roles are highly variable from region to region, but foliage gleaning is the least variable. The most important trophic role in all regions is that of the aerial insectivores, followed in order of decreasing importance by frugivory, foliage gleaning, nectarivory, piscivory, oamivory and sanguinivory.