About Rhamphomyia marginata (Fabricius, 1787)
Rhamphomyia marginata is a species of dance fly that belongs to the fly family Empididae. This species is distributed across Europe, ranging from Great Britain eastward to Romania, and from Fennoscandia southward to France, Austria, and Hungary. Rhamphomyia marginata has an unusual (though not unique) trait: it is the females of the species that form swarms, rather than the males.