In summing up the results of our study of the local varieties of maculipennis in a region of Macedonia, we have tried to deal with the region as a thing by itself, without allowing ourselves to be influenced by what we might know regarding the varieties of maculipennis found elsewhere.

We found a maculipennis nearly uniform throughout the whole region as regards habits and morphology, and not varying greatly except with respect to one character, the sculpturing of the eggs. On the basis of this character, we may make two groups, provisionally called typicus and messeae, but we must use statistical methods to establish these two groups, for we find much variability in them. The amount of variability is not uniform over the whole region; in some localities the egg-type is nearly all typicus, in others messeae greatly predominates. Our problem has been to test the validity of this characteristic, especially with regard to its persistence from parent to offspring and its constancy in varying environments.