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Thank You for both of You! The wikiedia-article was really interesting, that these 'bat-flies' are beginning to form castes. (I also read about yet another bat-flies, Chyropteromyzidae, they are Heleomyzoidea, living in guao, alsofound from Hungary so far 2 times).

The pdf articles are also nice and interesting, good to see such big cladograms of Empidoidea, since currently I'm learning for my exam about Evolution :)