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Externally it seems to me to fit the description of speciosa more than dives. The wing should be 'brownish tinted' for dives and here it looks clear. Also the haltere looks to be dark with a yellowish stem. The bases of the tibiae on the fore and mid legs look especially light. Also the pattern of light and dark on the side of the abdomen seems to fit speciosa slightly more than dives. So I suggest that it might be Callomyia speciosa rather than C. dives.

Jeremy