CHAPTER XI.

Insects, continued.—Order Lepidoptera. Courtship of butterflies—Battles—Ticking noise—Colours common to both sexes, or more brilliant in the males—Examples—Not due to the direct action of the conditions of life—Colours adapted for protection—Colours of moths—Display—Perceptive powers of the Lepidoptera—Variability—Causes of the difference in colour between the males and females—Mimickry, female butterflies more brilliantly coloured than the males—Bright colours of caterpillars—Summary and concluding remarks on the secondary sexual characters of insects—Birds and insects compared 386-423 FOOTNOTES

THE DESCENT OF MAN, AND SELECTION IN RELATION TO SEX By Charles Darwin IN TWO VOLUMES.-Vol. II. WITH ILLUSTRATIONS

CONTENTS FOOTNOTES

INDEX