Charles H. Smith is Professor of Library Public Information Services at Western Kentucky University. His research interests include biogeography and evolutionary theory, systems theory, bibliography, and Alfred Russel Wallace. He has published four books, nearly a hundred journal articles and reviews, and currently maintains the website The Alfred Russel Wallace Page at http://www.wku.edu/~smithch/index1.htm His previous book publications are Alfred Russel Wallace: An Anthology of his Shorter Writings; Biodiversity Studies: A Bibliographic Review; Alfred Russel Wallace: Writings on Evolution, 1843-1912; and Alfred Russel Wallace: Evolution of an Evolutionist. George Beccaloni is Curator in the Department of Entomology at the Natural History Museum, London. A Fellow of the Linnean Society of London and Royal Entomological Society of London, he also set up set up the A. R. Wallace Memorial Fund. His publications include numerous research articles and the following books (as co-editor): Hostplants of the Moth and Butterfly Caterpillars of the Oriental Region; Hostplants of the moth and butterfly caterpillars of America north of Mexico; and Host-plants of the Neotropical Butterflies: A Catalogue (forthcoming).