There are two Hippotion sp. in South Africa: Hippotion celerio and Hippotion osiris. I can't separate them from a picture, however I would tend to Hippotion celerio, because Osiris has much stronger markings as Celerio. But for definitive exclusion of Osiris you would need to see the complete hindwings.
http://de.wikipedia.org/wiki/Hippotion_osiris
http://en.wikipedia.org/wiki/Hippotion_celerio
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