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Next update.
On "family-level" I have now redirected to keys on "external sites".
The keys are mostly for North or Central European species.

In the following families, it is possible to get to genus, and in many cases, species - level.

Acartophthalmidae,Anthomyzidae,Asilidae,Asteiidae,Athericidae,
Bombyliidae,Braulidae,
Camillidae,Campichoetidae,Canacidae,Carnidae,Chamaemyiidae,Chloropidae,Chyromyidae,Coelopidae,Coenomyiidae,Conopidae,
Diastatidae,Dolichopodidae,Drosophilidae,Dryomyzidae,
Empididae,Fannidae,Gasterophilidae,
Helcomyzidae,Heleomyzidae,Hippoboscidae,Hybotidae,Hypodermatidae,
Lauxaniidae,Lonchaeidae,Megamerinidae,Micropezidae,Milichiidae,Muscidae,
Nycteribiidae,Odiniidae,Oestridae,Opomyzidae,
Pallopteridae,Periscelididae,Piophilidae,Pipunculidae,Platystomatidae,Pseudopomyzidae,Psilidae,Rhagionidae,Rhinophoridae,Sarcophagidae,Stratiomyidae,Strongylophthalmyiidae,
Tabanidae(in Swedish:P),Tanypezidae,Therevidae,Xylomyidae,Xylophagidae.

/Leif Karlsson