In some cases their ethnical relations have not yet been completely determined.
When, for example, Hagar, the "Egyptian," is the ancestress of Ishmaelite tribes, the evidence makes it very unlikely that the term is to be understood in the strict ethnical sense; and there are other passages more suitably interpreted on the hypothesis that the wider extension of the term was once familiar.
The Gonds are the most numerous among the aboriginal tribes, but so great an intermixture has taken place between them and the Hindu races that they have lost their language and most of their ethnical characteristics, such as the flat forehead, squat nose, prominent nostril, dark skin, &c., and are scarcely distinguishable from the other classes of the Hindu labouring population.
The natural geographical and ethnical southern frontier of Egypt is the First Cataract; Egyptian scribes of the Old Empire recognized this truth no less clearly than Diocletian, and Juvenal anticipates the verdict of every modern observer when he describes the " porta Syenes " as the gate of Africa.
Then followed a time of great ethnical confusion in South Africa, during which tribes flourished, split up and disappeared; but ere this the culture represented by the ruins in Rhodesia had waxed and waned.