RES Handbook Vol 7 Part 2a i. Hymenoptera - Ichneumonoidea

This part of the Handbooks includes a provisional key to the subfamilies of Ichneumonidae and keys to species of the Ichneumoninae, excluding the Ichneumonini which will be included in the next fascicle. There are, at present, nearly 2000 species of Ichneumonidae recorded from the British Isles, and it is thus by far our largest family of insects. From the world, it is estimated that there are about 20,000 valid described species and, as yet, the fauna of most tropical regions has been comparatively little worked; however, it does appear that this closely knit family is particularly well represented in the north temperate region.
J. F. Perkins
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res handbooks out of print ichneumonid wasps