Full title:
American entomology : a description of the insects of North American, with illustrations drawn and colored after nature / by Thomas Say ; edited by John L. LeConte ; with a memoir of the author by George Ord.
A lovely historical work. High resolution scans of individual plates (at the end of each volume) can be downloaded as JPEG2000 files. (Use a utility such as IrfanView to view them or convert them to other formats.) Many of the plates are lovely, and it is fascinating to see the first illustrations and descriptions of many of our common species.