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I thank the following staff of the FWS who read the manuscript and furnished many helpful suggestions: C. E. Faulkner, D. MacDonald, J. W. Peterson, J. F. Rogers, Jr., and personnel at the Denver Wildlife Research Center. I am particularly grateful to D. L. Trauger for his continuous encouragement. The following also read the manuscript and made constructive comments or provided information: P. N. Acha, Pan American Health Organization; L. Ajello, U.S. Centers for Disease Control; D. G. Constantine, California Department of Health Services; G. S. Dutt and D. T. Harrje, Princeton University; W. E. Howard, University of California at Davis; T. H. Kunz, Boston University; M. D. Tuttle, Milwaukee Public Museum; and W. G. Winkler, U. S. Centers for Disease Control; the staff of the Enforcement Division and registration Division, U.S. Environmental Protection Agency; and the U.S. Internal Revenue Service.

I am grateful to R. W. Barbour, University of Kentucky, who permitted the reproduction of the bat photographs which appeared in Bats of America by R. W. Barbour and W. H. Davis, to J. Newel Lewis of Trinidad for his special line drawings, and to R. K. LaVal, Missouri Department of Conservation, for permission to reproduce his photographs of the artificial bat house. I thank the National Speleological Society for permission to reproduce the table by C. Conroy.