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Apologies Walter for taking a decade to reply. I've been studying this genus for some time and this is an exceedingly rare species. From what I can see in your images it checks out as Neria longiceps.
I summarise everything I can find out about it at http://micropezid...my/term/25
Key in Roháček, J., & Barták, M. (1990). Micropezidae (Diptera) of Czechoslovakia. Casopis Slezskeho Zemskeho Muzea Opava (A), 39, 97–111.
One to keep a lookout for.
I would appreciate details of its location (Lat/Long perhaps)