Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
A Catalogue of the Butterflies of the United States and Canada
By Jonathan P. Pelham
The Lepidoptera Research Foundation, Inc., 2008
ISBN: ISSN 0022 4324
Cite: 268737 with citation markup [cite:268737]
Can only be ordered through Bioquip.

2016 online version
View online version revised 11 March 2016 at Butterflies of America here.

This work is also placed under Links (1)

Edit: The online version was revised 13 April 2021.

2012 online version
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Here
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WOW!
Thanks for adding this link!
Now I don't have to take that heavy tome off the shelf every time. Also great for people on a limited budget.