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A pdf copy of the following work is needed:
Sack,P., 1936, Cyrtidae (Acroceridae), [in] Lindner,E. (ed.), Die Fliegen der palaarktischen Region, Band iv/1, 36 S. 3 Taf. E.Schweizerbart'sche Verlag. Stuttgart

or at least the page 20, containing description of “hirtus”.

regards,
Muhabbet