6 .-- Cardinalis virginianus.

31 Males.] In the next diagram (Fig.

5) we have the variations in forty males of the Red-winged Blackbird (Agelaeus phoeniceus), and here we see the same general features.

One-fifth of the whole number of specimens offer a large amount of variation either below or above the mean; while the wings, tail, and head vary quite independently of the body.

The wing and tail too, though showing some amount of correlated variation, yet in no less than nine cases vary in opposite directions as compared with the preceding species.
The next diagram (Fig.