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Hello there,
I found these larvae in a log hole, in wet sawdust, not in water (Dordogne, South West of France)
Here are photos of them dried and dead (they didn't move!) 2 days later, and prepared ( Canada basalm).
I'm not a specialist but I think they are Chloromya (Stratiomiydae) or Psychoda (Psychodidae). 20 tergites.
Can I have more information, link or ID ?
Thanks for answers.
Dauges

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I would say these are Psychodidae. Telmatoscopus is known to breed in tree rot-holes. There is a key to genera of larvae in Wagner. R. 1997 Psychodidae. in Nilsson, A.N. (Ed.) Aquatic insects of North Europe - a taxonomic handbook. Vol.2.

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Many thanks Tony.

Philippe alias "Dauges"

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In my opinion the only described species with these characteristics (20 tergal plates and robust quadrangular head) is Copropsychoda brevicornis. In most other species the tergal plates are restricted to the last 2-3 segments or they have 26-27 plates on the full body. The only other species with 20 plates is Psychoda minuta , but the siphon is much longer in that species (about 6 times longer than width in minuta and reduced in Copropsychoda). Both species are quit small (up to 3mm), I'm not sure if Copropsychoda do have some more species in France. According to Smith (1989) C. brevicornis is adapted to feeding on the surface of dung. I have no reference for this species from treeholes. The larva of P. minuta (=P.spreta) has been reared from cow dung and rotting grass cuttings.