RES Handbook Vol 6 Part 1. Hymenoptera - Introduction and key to families (2nd edition)

THE order Hymenoptera possibly contains more species than any other group of British insects. The smaller parasitic species are still not well known but seem to be very numerous. Nixon, for instance, in the 1940's described more than seventy new British species in the genus Dacnusa. In the ICHNEUMONIDAE, many genera are thought to contain twice as many British species as have as yet been recorded. There is also a very great deal to discover about the biology of most groups.