I have just received a copy of a new paper by Kazuyoshi Yoshino, with descriptions of a new Papilionid and 2 new Nymphalid subspecies from Vietnam.
Citation: Yoshino, K. 2017. Description of 3 New Subspecies from Central and Southern Vietnam. Butterfly Science, 7: 25-31.
The new taxa are: Graphium phidias obscurium (TL: Dalat, alt. 1,500 m, Lam Dong Prov., S. Vietnam) Neurosigma siva dalatica (TL: Dalat, Mt. Lang Vien, alt. 1,900 m, Lam Dong Prov., S. Vietnam) Polyura dolon southernensis (TL: Dalat, alt. 1,500 m, S. Vietnam)
The paper also records a female of Pazala mullah kooichii from "suburb of Kontum town, alt. 1,100 m, Kontum Prov., C. Vietnam."
I have compared the sole specimen (holotype) of obscurium with many more specimens of phidias, and it is different. However it is not possible to know from a single specimen whether this is just an aberration or the difference is consistent in the population. More specimens of the new subspecies need to be seen in order to conclusively decide whether or not it is valid. It is worth noting that a number of taxa from the Dalat area are distinctly different to those from other parts of Vietnam.
Here's the holotype photos from the paper:
Note the single very small orange spot at the hindwing anal angle. All the other specimens I examined have two larger spots, also the discal bars of the hindwing in spaces 1b to 4 are reduced compared to nominate phidias, but again I stress that this could just as easily be an individual aberration, and subsequent specimens could just prove to be normal.