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Hi,

As for the fly this is Otitidae, but these images do not match O. formosa images on the net (which might be wrong of course.) (Added later: Actually they match quite well with O. formosa at diptera.net. so the other images on the net are likely to have been misIDd.)

There are more than one species of Enthomophtora feeding on Diptera, so the situation is clearly the same as with the entomophagic fungi affecting Coleoptera. The problem is that many of these fungi do not grow without the host so it is not easy to maintain them. (That is why there are so many undiscribed fungi).

For example this fungus has reddish hyphae, if it is not an artifact. E. muscae should have whitish hyphae, So this is probably not E. muscae, but this is impossible to tell without microscopic and most likely DNA analysis.