The wingspan is 31–46 mm for males and 38–47 mm females. Adults of subspecies P. t. thero are on wing from September to November and again from March to May in two generations. Adults of subspecies P. t. cedarbergae are on wing from October to November and probably also in autumn.
- Phasis thero thero (from the Cape Peninsula, north along coast to Lambert's Bay, east to Knysna)
- Phasis thero cedarbergae Dickson & Wykeham, 1974 (Cederberg and Gifberg)
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