A classic entomology text with many illustrations. Other editions were published in 1930 and 1936. (Glenn W. Herrick was co-author on the third edition.) The first edition (1895) is in the
public domain according to the law in the United States, and should be a good source of diagrams for the BugGuide
glossary, for example.
Various editions back to the 1890's--
link to the 1930 edition at the
Biodiversity Heritage Library.