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it's definitely not a stratiomyd, for it has no leathery skin. As I'm only an aquatic larvae expert this terrestrial larva looks a bit like a Sciomyzidae or a Muscidae. But perhaps maybe also something like a Phoridae or any other Cyclorrhapha. For instance, it is know that some Phoridae larvae parasitize trhe pupae of Formica (Aenigmatias) or are parasitoids of adult worker ants (Pseudacteon) (see Smith, K.G.V. 1989, immature stages of British flies)