If there is no definite affirmative of the identity of Papilio terpsicore, ie. no type specimen, drawing or proper description, then it cannot be used no matter how high the probability that it is the same as A. violae.
I am more interested in how the name Tawny Coster comes about.
I have seen it being written as Tawny Coaster, so it may be a corruption of this or even Castor (genus Ariadne which hostplant is Castor-oil plant).
As it is, Coster is quite meaningless, but perhaps an accountant can comprehend it.
TL Seow
PS. Linnaeus uses the names of many deities & heroes of Greek mythology.
Terpsichore with an 'h' is the accepted spelling in transliterated Greek. She is one of the Nine Muses.
Terpsichore is the goddess of dance & choral singing.
Although spelt as 'Terpsicore' this cannot when in use be corrected to 'Terpsichore' (except perhaps by the author on application to ICZN).