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Chloropidae: Thaumatomyia spec. is correct. Not all Thaumatomyia species possess those peculiar eversible testicle-like odor sacs (= vesicles), e.g. T. trifasciata, rufa and hallandica males lack them. Boppré & Pitkin (1988, Entomologia generalis 13(1-2): 81-85), Steyskal (1945, Bull. Brooklyn ent. Soc. 40(2): 48), and Kotrba (2006, Europ. J. Ent. 106(1): 57-62) wrote about attractions, repellents, odors, pheromones, display, fight, wing waving, copulation and alcaloids in connection with Thaumatomyia. It is well known that the huge overwintering swarms of Th. notata in buildings and hollow old trees let behind smelling bio-chemicals which attract one or more autumns later again new masses of those flies. Thaumatomyia [ancient Greek] means "noteworthy fly", notata [Latin] means "should be noted", too. Meigen (1930) selected a well agreeing name and he knew the aggregation phenomenon. I collected 278 articles and notes published about it during now 190 years [see database].