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Well I encountered more. I also encountered the names toponiem Quaadvlieg te Valkenburg-Houthem, Koevliegenstraat or Koeivliegenstraat (< Kwade Vliegenstraat) in Maastricht.
Reverring to the interpretation of a cowfly or an angry flies.
So I was wondering, is the hydrotaea irritans a cowfly? Or known for his anger?
I have heard of killer bees, but angy flies? Does anyone know of any interesting stories related to that subject?