|Mummified larva of Acronicta rumicis|
|Acronicta rumicis 'mummy' showing the parasite's emergence hole|
|The parasitic wasp cooled down and quiet. 1 square = 5mm.|
So, time for identification. It's a wasp of some sort within the superfamily Ichneumonoidea. However, the abdomen isn't on a thin stalk and the wing venation indicates it is of the family Braconidae rather than Ichneumonidae.
|Braconid wasp showing wing venation|
|For comparison, the wing venation of the braconid Aleiodes praetor, from Huddleston & Gauld (1988)|
|Aleiodes sp. showing ridges on the first two abdominal segments (blue arrows)|
|Ventral view of Aleiodes showing orange legs with some black areas, and orange mouthparts.|
Broad, G. R., Shaw, M.R. & Godfray, H.C.J. (2012). Checklist of British and Irish Braconidae (Hymenoptera) [30th April 2012 version]. Free download here.
Huddleston, T. & Gauld, I. (1988). Parasitic wasps (Ichneumonoidea) in British light-traps. The Entomologist 107(2): 134-154.
Shaw, M.R. & Huddleston, T. (1991). Classification and Biology of braconid wasps (Hymenoptera: Braconidae). RES Handbooks for the Identification of British Insects 7(11): 1-126. Free download here.