New specimens of Proconsul from Koru, Kenya

The morphological and metrical definitions of the three species of Proconsul: Proconsul africanus, Proconsul nyanzae and Proconsul major, are reviewed. New finds of large fossil primates from the Lower Miocene deposits at Koru, Kenya are described and assigned to two of these species; P. africanus and P. major. The large sample of P. major from Koru permits a more complete understanding of the morphology and variability of this species and necessitates a revised diagnosis. The increased range of variation for this species is discussed in the light of sexual dimorphism and species variability in extant African hominoids.