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Well, well, ... the specimen told another story. The last antennal segment bears a small apical nipple, placing it in Forcipomyiinae. Wing characters and the seta on the paratergite lead to Atrichopogon. The enormous genitalia lead to subgemnus Psammopogon and that means a species new to the Netherlands. Just downloaded the key but have no time today to finish the ID. Maybe tomorrow...?