Semagystia tristis is a moth in the family Cossidae. It was described by Andreas Bang-Haas in 1912. It is found in TurkmenistanÖsterreichische Turkmenistan-Expedition 1993 und 1996 (Karagai-tau), the Mongolian Altai, Kazakhstan, Tajikistan, Kirghizistan and Afghanistan., 2011: Catalogue of the Family Cossidae of the Old World. Neue Entomologische Nachrichten, 66: 1-129.
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