Un'opera completa ed esaustiva sulla sistematica dei ditteri della Scandinavia, che ha rappresentato per molti anni una pietra miliare per chiunque si dedichi allo studio della entomologia. Zetterstedt descrive molte nuove specie, molte delle quali ancora oggi valide. Il testo è riccamente illustrato con disegni e litografie originali dell'autore.

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