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Well it seems there are keys to all 3 known species in both the following, if somebody can send me the relevent pages from either I would be grateful.

Papp L. 1994: A new Cremifania species from Hungary (Diptera, Chamaemyiidae). Annales historico-naturales Musei nationalis hungarici 86: 105-107.

Papp L. 1998: 3.39. Family Cremifaniidae. In Papp L. & Darvas B. (eds): Contributions to a Manual of Palaearctic Diptera. Vol. 3., Higher Brachycera. Science Herald, Budapest, pp. 409-414.