This name is a synonym of Elaeis oleifera (Kunth) Cortés.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 460489) with original publication details: Vidensk. Meddel. Dansk Naturhist. Foren. Kjøbenhavn 1858: 51 1859.
This name record (from WCSP) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Elaeis melanococca in version 1 of The Plant List.