Very special: a female Acantholeria cineraria, most likely, since it is also possible that it is a A. dentibia. I was caught in a Malaise trap in the high Alps by Ben Brugge in 1981.
At first I believed to deal with an Acantholeria, but after careful checking it proved to be a Morpholeria ruficornis. This species was just known from Zuid Limburg.
If looking quickly to the costa you may think it is a Heleomyzidae, which has been caught in a malaise trap in Yemen. But it is not. I think it is likely a Ephydridae with spiny coast