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if Paul Beuk or Theo Zeegers has no opinion, then i don't know of a Tabanidae specialist. Fauna Europaea lists Dr. Chvala but i don't recommend contacting him. He is old and not very helpful. I've written to him before about Hilara. He seems disinterested in helping.

Dr. Bystrowski is very nice and very helpful. You could ask him for an opinion if noone answers. He may even be able to recommend a specialist if you ask him about it.