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I want to draw the attention of everyone who is interested in Muscid of Central Europe.
There are two independent keys for Mucsid:
one by Hennig for the Palearctic fauna (in German), which is abbreviated and used by Gregor et al. for Central Europe
and the other for the British fauna by d'Assis Fonseca.
For dipterist from Leicestershire Fonseca's book is even better. For dipterist from other European countries Fonseca's book is still very useful! The best approach is to use both books. Fonseca's pdf is also available.