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I've studied the distribution in Europe.
Details at http://micropezid...my/term/38 where you will find literature sources listed (contact me if you want copies) and map of countries compiled from these + Fauna Europaea.
Additionally I'm in the process of compiling checklists for all the European countries (http://micropezid...o/node/319) where you'll find details of the evidence for its presence.
I too have difficulty in locating any Austrian dipterists (or checklists), I've tried the Natural History Museum in Wien without success.