Dubois thought he had found the missing link (ape=pithecus, man=anthropus), but it turned out to be more human than he realized and is now considered an example of Homo erectus. Recent findings indicate that Pithecanthropus, Neanderthal, and modern man may have co-existed as recently as 30,000 years ago [Time, December 23, 1996, article].
Newsweek had a related article, which included the following graphic.