Graphium schaffgotschi is a virtually unknown African Graphium species, rather recently elevated to species status. Here is a 1931 specimen, ex-Fontaine collection. The verso is subtly different from G. taboranus.
Maurice Fontaine was a belgian entomologist who has been collecting for many years in D.R.C. (Sankuru, Shaba, and others) for the MRAC in Tervuren. He was living in Marcinelle were I met him in the 80's. If I remember well he was a doctor. He wrote many papers in Lambillionea between 1980 and 1991 on early stages of butterflies, mainly Nymphalidae including my favorite genus Cymothoe. He discovered many species and subspecies such as Cymothoe isiro, Cymothoe fontainei, plus many others ... He died some 10/15 years ago ! I have to find in my documents a photograph I took from him in these days.
François-Guillaume Overlaet seems to be quite a mysterious character. To my knowledge he was studying all the material (nearly excusively the genus Cymothoe) at MRAC, and has not been a collector in Africa, but nothing much has been said about him. I had F.-G. Overlaet manuscript about his unpublished Cymothoe revision, which I gave to my friend Steve Collins together with my collection. If anyone has some more informations or photograph about this man, I would be more than happy to hear ?
Personnaly, I think he described to many seasonal forms that don't help the revision of this genus ...
Ah yes, along the anal edge (I hope that the correct description). I had read elsewhere that the key difference between the species was that G. schaffgotschi has more extensive white markings on the FWs, which is not at all evident in any of the photos I've seen.
Thanks for the clarification!
EDIT: I've looked at the photos some more and am back to a certain level of uncertainty. The photo posted in this thread - to me - resembles more the G. taboranus specimens pictured at the Albertine Rift Project.