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Chris's comment is generally true but this excellent photo depicts an insect identical in all visible respects to our museum specimen determined by both Brock and Aubert. Chthirion is correct :p:p unless we have both been misled by a truly (ad I think impossibly)remarkable mimetic. We (RN JP O'Connor, Dublin) work on Ichneumonidae using a combination of expertly identified specimens and keys, descriptions and monographs (Ulster Museum National Museum of Ireland). Incidentally we only have three specimens all from Scotland. Summary Pristiceros infractorius surely.