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W.P.J. Overmeer

further genetic analysis. Reciprocal differences are also observed with respect to the hybrid sterility (cf. table III). Backcross series under selection pressure of a discriminating concen- tration (25 ppm) were carried out to examine whether material could be made compatible with S. Since reciprocal

Borneo; most of these individuals are males. A craniometrical study of all of these races shows that the female skull is smaller than the male, with a proportionally wider brain case and greater height, etc. There prove to be racial differences in the size of the male skulls relative to that of the