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Hi Carnifex,

The head looks like a Hymenopterous larvae. But the anterior spiracle looks highly unlikely for a Hyemnopterous larvae. There is no real pharyngeal skeleton visible. So it cannot be a acalyptrate or calyptrate larvae, as far as I know.

There are Braconidae (Euphorinae) which parasitize adult holometabolus insects such as Coccinellidae (Coleoptera) and Bombus sp. (Apoidea).

In the Diptera family Pipunculidae there are species in the genus Nephrocerus which parasitize other adult Diptera of the family Tipulidae.

Also a possibility that it is a very young larvae of Tabanidae which hatched and was somewhere in your sample.

For an accurate identification a better picture of both the head and the posterior spiracle would be needed.

Hope this helps,

Greetings,
Ectemnius