Two further specimens of Lycyaena silberbergi Broom have been found, one from the Sterkfontein Type Site and the other from Swartkrans. These include regions of the mandible anterior to what was present in Broom's type specimen, and permit the addition of some further details of the structure of this species.
A new species, Lycyaena nitidula, is described from Swartkrans. One fragment from the Sterkfontein Type Site probably also belongs to this species.
All the species of hyaenid at present known from the three sites, Kromdraai, Swartkrans and the Sterkfontein Type Site are tabulated. Their relationships to other hyaenids are discussed, and their implications as to the relative and absolute dates of the three deposits are considered. It is concluded that of the three deposits the Sterkfontein Type Site is the oldest, separated by only a short time interval from Swartkrans, with Kromdraai later still and separated from Swartkrans by a rather longer time interval. Kromdraai is estimated to be of early Pleistocene age, and Swartkrans and the Sterkfontein Type Site are considered to belong to the top of the upper Pliocene.