Illustration on plate IV in the book:
Dubois, A. 1905. Remarques sur l’ornithologie de l’Etat indépendant du Congo. Ann. Mus. Congo Zool. Sér. IV. Tome I (Fasc I): 1-36, 12 plates.
URL: http://bhl.ait.co.at/index.php?form=display&oaiid=RMCA/6C41697C1B344B71BE5066AF14285727
Due diligence has been applied and recorded, and the rights owner of the illustration could not be traced.