The Insect and Arachnids of Canada. Part 14. The grasshoppers, crickets, and related insects of Canada and adjacent regions...By Vickery, V. R. and D. K. McE. Kevan
The grasshoppers, crickets, and related insects of Canada and adjacent regions: Ulonata: Dermaptera, Cheleutoptera, Notoptera, Dictuoptera, Grylloptera, and Orthoptera.
Guide to the Dermaptera, Orthoptera, and more of Canada and adjacent regions, with keys, descriptions, and distributional data.
Publisher website containing the free PDF here: https://esc-sec.ca/publications/aafc/
The free PDF itself currently here: https://esc-sec.ca/wp/wp-content/uploads/2017/03/AAFC_insects_and_arachnids_part_14.pdf