The only differences between holomelas and edwardsi were colouration and size. As no morphological differences have been noticed between the two taxa, I would say that holomelas is just a melanistic version (or just a darker form) of edwardsi. The reason holomelas it is claimed to be smaller than edawrdsi is because all specimens caught have been significantly smaller. However this may be due to a bias in the rate of predation, as holomelas wouldn't be as well camouflaged and would be more easily visible to predators. It would therefore, on average, not survive as long (and hence not grow as large) as edwardsi. However, I may be wrong, but the lack of any definitive morphological differences whatsoever between the two taxa indiciate to me that they are conspecific.
It definitely isn't in the Holocene extinct Primates area now (there are only 28 entries, less than a page) so it would be impossible to miss it, so it must have been deleted (though sometime ago if it doesn't show up in the Security Log). Unless there is a small chance that you never posted such a thread Baghira?
I reported the search engine problems again to Proboards. See if we get an answer. Also searching manually I cannot find the thread. It seems it isn't here as suggested. If it has been here before, I guess it has somehow been deleted, although at the moment I cannot see or find when or why.