yi CONTEXTS. 



CHAPTER X. 



SECONDARY SEXUAL CHARACTERS 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. — Diptera. 

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

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

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

 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 331 



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 "exual Characters of In- 

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



