vi CONTENTS. 



CHAPTER X. 



SECONDARY SEXUAL CHAEACTERS OF INSECTS. 



Diversified Structures possessed by the Males for seizing the Females. — 

 Differences between the Sexes, of which the Meaning is not under- 

 stood. — Difference in Size between the Sexes. — Thysanura. — Dijftera. 

 — Hemiptera. — Ilomoptera, Musical Powers possessed by the Males 

 alone. — Orthoptera, Musical Instruments of the Males, much diversi- 

 fied in Structure ; Pugnacity ; Colors. — Neuroptera, Sexual Diflerences 

 in Color. — Hymenoptera, Pugnacity and Colors. ^Coleoptera, Colors ; 

 furnished with Great Horns, apparently as an Ornament ; Battles ; 

 Stridulating Organs generally common to Both Sexes, , page 831 



CHAPTER XI. 



INSECTS, continued. — order lepidoptera. 



Courtship of Butterflies. — Battles. — Ticking Noise. — Colors common to 

 Both Sexes, or more brilliant in the Males. — Examples. — Not due to 

 the Direct Action of the Conditions of Life. — Colors adapted for Pro- 

 tection. — Colors of Moths. — Display. — Perceptive Powers of the Lepi- 

 doptera. — Variability. — Causes of the Difference in Color between 

 the Males and Females. — Mimicry, Female Butterflies more brilliantly 

 colored than the Males. — Bright Colors of Caterpillars. — Summary 

 and Concluding Remarks on the Secondary Sexual Characters of In- 

 Bects, — Birds and Insects compared, . .... p. 374 



