The Butterflies of North America: A Natural History and Field Guide - James A. Scott - Google Books

http://books.google.de/books?id=Oa5m8gZcGjMC&printsec=frontcover&dq=%22Butterflies+of++North+America%22&lr=#PPP1,M1

The only field guide to cover all North American butterfly species, this monumental work is also a complete natural history, fully describing the biological and ecological world of butterflies in general. It is without question the most important book on…