Butterflies of North America
Maps shown on this Web site were initially created by manually coding maps in the publications listed below. The new maps were checked for errors, but there is a possibility that some errors remain. Current maps may also reflect new county records that have been established since the date of publication. Users of this Web site need to understand that data are more complete for some species and counties than others. Absence of a county record for a particular species may mean that 1) the species does not occur there, 2) the species is present but has not been detected and reported yet, or 3) a county record exists but has not yet been added to our database.
Opler, Paul A. 1995. Lepidoptera of North America: 2. Distribution of the
butterflies (Papilionoidea and Hesperioides) of the eastern United States.
Contributions of the C.P. Gillette Museum of Insect Biodiversity.
Colorado State University, Fort Collins, Colo. Unpaginated.
Pavulaan, Harry and Paul A. Opler. 1995. Atlas of eastern butterflies.
Stanford, Ray E. and Paul A. Opler. 1993. Atlas of western USA butterflies,
including adjacent parts of Canada and Mexico. Published by authors.
Denver, Colorado. 275pp.
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