Brinton (1885) uses the name "anthropopithecus" in reference to ape-man and in contrast to "anthropus" for man. Brinton uses the name informally and not as a proposal for a new taxon.
Dubois (1892) in a quarterly field report describes the discovery of a femur, and in that same report introduces the name Anthropopithecus erectus specifically for the partial cranium (calotte) referred to as Trinil 2 or "Skull 1".
Campbell (1965) lists the name as potentially valid and notes that the genus name Anthropopithecus was established by Blainville (1838) for the chimpanzee as Anthropopithecus troglodytes, but Anthropopithecus is an objective junior synonym for Pan Oken, 1816. Dubois (1894) subsequently moved erectus to the genus Pithecanthropus.
Meikle and Parker (1994) provide a full translation of Dubois's (1892) report.
Pithecanthropus erectus is widely considered a subjective junior synonym of Homo erectus (LeGros Clark, 1964; Groves, 1989; Maclatchey et al. 2010). The latter name, and thus the species epithet, 'erectus', is widely used today and generally considered valid.
See reviews by Rightmire (1981), Leonard (1997), Anton (2003) for opinions about the hypodigm for the taxon.