Wilser (1900 p. 575) expressed his disapproval with the genus name Ptheecanthropus that Dubois establsihed for Trinil. Wilser (1900) indicated he would have preferred the name Proanthropus. Specifically Wilser (1900 p.575) states, "Ich halte deshalb auch die Wahl des Namens Pithecanthropus nicht fur die glucklichste und wurde Proanthropus vorgezogen haben." Which roughly translates to "I therefore do not consider the choice of the name Pithecanthropus to be the best and would have preferred Proanthropus." Based on this, the name Proanthropus is proposed conditionally. Becaise it is proposed before 1961 it is available (Article 15) but objectively invalid as a junior synonym to Pithecanthropus.