Featuring over 900 color illustrations, Butterflies of Pennsylvania is the most comprehensive, user-friendly field guide to date of all of the species of butterflies and skippers ever recorded in Pennsylvania. Information on distinguishing marks, traits, wingspan, habitat, larval host plants, and handy facts offer assistance for field identification. County-by-county maps show where each species has been recorded, and graphs detail when they are present and most likely to be seen.

James L. Monroe is a research associate at the McGuire Center for Lepidoptera and Biodiversity in Gainesville, Florida, and is professor emeritus of physics at Pennsylvania State University, Beaver.

David M. Wright is chairman of patient safety and quality council at Abington Health-Lansdale Hospital in Pennsylvania. He is an anatomical and clinical pathologist who has published extensively on the butterflies of Pennsylvania and neighboring states.

Description courtesy of University of Pittsburgh Press.