Description:
Acrosathe annulata is a tiny fly (10mm) and a common species on sandy soils, especially dunes. It occurs in Western Europe, Northern Africa and Turkey. It thanks its name "Stiletto Fly" to the relatively short stiletto-like antenna's.
I found this pair mating in the sand.
Stulpheide, Lage Vuursche, 5 June 2013