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Hi,
Seguis keys, what is it:o? I use Shatalkin (2000), but it is in Russian. In following paper is this key in English with updating. Schacht W., Kurina O., Merz B., Gaimari S.: 2004, Zweifluger aus Bayern XXIII (Diptera: Lauxaniidae, Chamaemyiidae), Entomofauna 25: 41-80. Next work is older, bud with good pictures of genitalia: Remm E., Elberg K., 1979: Terminaly much Lauxaniidae (Diptera) najdenich v Estonii, Latvii i Litve, Dipteroloogilisi Uurimusi, Tartu, 66-117. I use papers from B. Merz for Minettia fasciata group and Homoneura, I have it on PDF, if you wand, I can sand you it.
Katka