A highly useful and well-illustrated account of the families and subfamilies of Hymenoptera. Despite the large geographic scope, it is much easier to use than the UK-only RES Handbooks, especially for parasitic groups eg subfamilies of Braconidae and Ichneumonidae, although presumably less reliable in its handling of those spp which don’t obey the rules.

Can be down-loaded from the Entomological Society of Canada website.