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I find it difficult to judge from this photo. It's a tricky group, even with pristine specimens. There's a helpful paper in the Dipterists Digest 17: 1-6 (Medlock and Vaux, 2010 Morphological Separation of the European members of the genus Culiseta (Diptera, Culicidae)) - available at https://www.resea..._Culicidae