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Thank you for the tip! :)

Jason, I doubt it is a Sciarid, the head is not typical of Nematocera. It is more typical of Brachycera, or maybe closer still I think Cyclorrhapha.

http://www.aments...hapha.html

I found an image of a Medetera sp. larva which looks similar.

http://www.insect...um=0745042

There was larva of a small Staphylinid beetle on the fungus, I also saw an adult Staphylinid both of which were around 3mm. As Medetera appear to be predatory on the larvae or pupae of beetles can anyone tell me if this is possibly Medetera? I do have at least one species of Medetera which is ~4mm, M. truncorum. The fungus also had a mass of micro organisms waving about like tiny worms. The article mentions that medetera are bark beetle predators but maybe they can be found in fungi too?

http://books.goog...mp;f=false