Thaumatomyia glabra (Meigen, 1830), Chloropidae. The only European Thaumatomyia species with largely reduced hairs on the body [the only reason for Loew (1866) to create an own genus for it, the synonym Chloropisca]. Well known as a chloropid with zoophagous larvae, predators of root lice (Pemphigidae), e.g. on the roots of carrots. Different from its congeneric species notata (Meigen) it rarely aggregates in swarms in autumn. But single specimens regularly enter the notata swarms. In North America several publications report swarms. The species is well known as a flower visitor as documented on this photo. The first detailed article on the biology: Parker, J.R. 1918: The life history and habits of Chloropisca glabra Meig., a predaceous oscinid (chloropid).- Journal of economic Entomology 11: 368-380. (See id=71905&pid=305995#post_305995)