In 1960, Robert Herbert Carcasson wrote: "Male very similar to above (fulleborni), but white band very narrow in both wings. Female similar to above (fulleborni), but ochreous discal area of hindwing much smaller. Both sexes may be distinguished from all other species of the group by the very much darker underside."
Taxonomy
Papilio sjoestedti is a member of the echerioidesspecies-group. This clade includes:
Carcasson, R.H. 1960 "The Swallowtail Butterflies of East Africa (Lepidoptera, Papilionidae)". Journal of the East Africa Natural History Societypdf Key to East Africa members of the species group, diagnostic and other notes and figures. (Permission to host granted by The East Africa Natural History Society