Online illustrated key to the families of Nearctic chalcidoids, with some accompanying text. http://www.codex.begoniasociety.org/chalcidkey/index.php
From the web site:
"All text and drawings are taken from the original, priceless and out of print key:
Grissell, E. E., and M. E. Schauff. 1990. A handbook of the families of Nearctic Chalcidoidea (Hymenoptera).
Entomological Society of Washington (Washington, D.C.) Handbook 1:1-85.
Addional images for the key have been added by Dr Michael Gates at the USDA-ARS Systematic Entomology Laboratory (firstname.lastname@example.org). Website created by Katja Seltmann (email@example.com) with gracious help from the morphbank crew. Key hosted by the Hymenotpera Assembling the Tree of Life Project".