Seioptera vibrans

Seioptera vibrans is a species of ulidiid or picture-winged fly in the genus Seioptera of the family Ulidiidae.

The 5 to 6 mm long body is shiny black to blue, the head has a red forehead (frons) and a furrowed face. Both wings are transparent and tipped with a dark spot. The adults fly from May to September near trees, bushes, hedges; once landed, they wave their wings constantly. They feed on flower pollen and small insects ( aphids ). The larvae live in litter (decomposing plants that they help to transform).