The wingspan is 22-37.5 mm for males and 24-42.5 mm for females. Adults are on wing from September to December and August to October in Namaqualand. Subspecies terblanchei is on wing from January to March. The peak flight times vary per locality.
- Thestor protumnus protumnus – Cape Peninsula, south-western Cape
- Thestor protumnus aridus van Son, 1941 – Cape, Free State
- Thestor protumnus terblanchei Henning & Henning, 1993 – Free State
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