Macrocentrus bicolor
This came to light on a particularly warm night. I used Gavin Broad's key to nocturnal Ichneumonidae to key this to genus and then van Achterberg's 1993 revision of the Macrocentrinae to get it to species.
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female Macrocentrus bicolor showing forewing, hindwing, head from above, side and front, palps, upperside of mesosoma and base of metasoma, hind trochantellus (outer side to show apical teeth), hind tibial spur and basistarsus and tarsal claw, North Elmham (Norfolk, UK), 12th August 2024