This beautifully illustrated book belongs in the hands of everyone interested in the butterflies of southern California. In addition to providing tips on identifying similar species, this guide provides a great deal of general information on butterfly biology and ecology, as well as ecosystems in San Diego County. This book is the perfect regional reference, useful throughout southern California, for butterfly watchers, general naturalists, as well as amateur and professional Lepidopterists.” - Dr. Andrew Warren, McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History.