Sarangesa seineri, also known as the dusted elfin or dark elfin, is a species of butterfly in the family Hesperiidae. It is found in South Africa (Natal, Transvaal), Botswana and from Zimbabwe to Kenya and the DRC.

The wingspan is 36–38 mm for males and 38–40 mm for females. Adults are on wing year-round, although they are scarcer in winter and the dry season.

The larvae feed on Peristrophe hensii.

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