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The title here should be Calliopum sp? we cannot yet suggest a species in the title.
John is superb at placing a fly into a family or genus and he questions this one with good reason: it is dark and doesn't fit Calliopum. I have both male and female C. simillimum and it doesn't match.

I am not even sure if it is Calliopum. I think that it resembles Calliopum but the arista should be yellowish and the antennal segments should be reddish or orange. Plus, i usually find Calliopum with yellow tint on the wings.

IF this is a Calliopum species, then Shatalkin's keys indicate Calliopum splendidum: yellow hind and mid tibia, 4 rows of ac.

I think that we should be certain that this is a Calliopum species before trying to place a species level id. The photos are not very good and we have no genitalia.

Paul is excellent with Lauxaniidae, so we should wait to see if Paul has an opinion.