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The flower fly genus Ischiodon Sack (Diptera, Syrphidae) is revised and a new species, Ischiodon astales sp. n., is described from Madagascar. Additionally, a lectotype for Ischiodon aegyptius is designated and the first records of Ischiodon scutellaris for the Arabian Peninsula are reported. Diagnoses, illustrations, synonymies and distributional data are given for all described species, as well as an identification key to all known species.