The Biodiversity Heritage Library is dedicated to scanning old natural history volumes and making them available to contemporary readers as PDFs or OCR files. One of the recent additions is Volume 1 (covering Nymphalidae) of The butterflies of the eastern United States and Canada : with special reference to New England by Samuel Hubbard Scudder. The edition is 1889 and comes from the MBL/WHOI library on Cape Cod.
I’ve added it to the LepLog library. It’s a rather large file (766 pages) and will take a few minutes to download but is replete with ecology, biology, and identification notes on some of the most iconic Eastern US butterflies.
Read or download Scudder 1889 Vol 1 Nymphalidae here.