Abstract
The three races, A. B, and C composing Drosophila auraria have been discussed with regard to sexual isolation and speciation problem.
Intraracial sexual isolation between different geographic strains of race C, regardless of the strains used, is not significant, while interracial sexual isolation, in every case between A and B, A and C, and B and C, is significantly demonstrated.
Genetically diverged distances in relation to the coeffcients of joint isolation and some characteristics of the three races are respectively illustrated in the Fig. 1.
It can hardly be concluded from the morphological, physiological and distributional standpoints, that, of the members belonging to species auraria, race B would be an original form of them.
