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Summarising NW-European data from Van der Goot (1985):
Belgium: rather rare in the hills
Netherlands: south in the province of Limburg and about five other inland localities in woodland area
France
Germany
Denmark (not after 1900)
Poland

These are the most recent data I have here, though there are one or two more recent record from the Netherlands.

Reference: Goot, V.S. van der, 1985. De snavelvliegen (Rhagionidae), roofvliegen (Asildiae) en aanverwante families van Noordwest-Europa. - Wetenschappelijke Mededelingen van de Koninklijke Nederlandse Natuurhistorische Vereniging 171: 1-66.

Hope this gets you on the way for now.