Similar species: Ganisa plana Walker, 1855. 
From Walker, 1855: This species (G. plana) much resembles G. postica, but may be distinguished by the straight band of the fore wings by the band of the hind wings, which in G. postica is further from the exterior border, and not accompanied by brown dots, and by the form of the hind wings, which in G. plana are more oblique and less convex along the fore part of the exterior border.

Note on species group: Ganisa postica Walker, 1855 and Ganisa plana Walker, 1855 are both valid taxon (included as separate species in the Global Bombycoidea checklist, 2018). This species group is very variable and doubtfully separated through photographs. They are difficult to separate without examining genitalia and comparing molecular phylogeny. Barlow (1982) states that postica is largely found is S. India and Sri Lanka, while plana is found in N. India, including the Himalayas. The member of this genus from India, Ganisa similis, is found in NE India, has an oblique dark diffused band on forewing, and is its forewings are generally more falcate (even more falcate in female) than postica and plana.