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Greetings from Stockholm!

Steve was right (as usual). It is a species of Thereva, and I do have a good idea of what it is. I have been working on a revision of the European Thereva here at the NRM, and it looks like Thereva albovitta Strobl. Previously it was only known from (southern) Spain, but Gerard and Michel Martinez have provided the first records from France (Pyrennes and "10 km [from] Montpellier" respectively). The range of this species also includes Tunisia, based on material I have on loan from the Zoological Museum, Copenhagen. I'm not surprised that you had a hard time identifying the specimen, Gerard, which is frustrating because the species is so striking. There are no available keys for Thereva species relevant to Spain and southern France, but I am working on that problem right now.

Cheers,
Kevin