COXTKXTS. Vll 



CHAPTER V. 

 PR TECT1 1 'E M TUT ('It Y. 



Mr. Bates' Theory. Mimicry often found only in Females. Are the 

 Danaidte strongly scented, like the Heliconidae ? Distastefulness 

 sometimes limited to a Few Individuals. Resistent Structure of the 

 Wings in Danaids an Additional Defence. Mimicry between Pro- 

 tected Forms. Mimicry between Insects belonging to Different 

 Orders. A Protected Insect sometimes Mimicked by more than 

 one Species. Mimicry of Vertebrates by Insects and of Insects by 

 Vertebrates. Mr. Wallace's statement of the Conditions under which 

 Protective Mimicry occurs. Objections to the Theory of Mimicry. 

 Resemblances among more or less remotely allied Animals which 

 perhaps cannot be put down to Mimicry. Instances of Developing 

 Mimicry in Butterflies. Butterflies more attacked by Birds in the 

 Tropics than in Temperate Regions. Spiders mimicking Ants. 

 Difficulty of distinguishing between Mimicry and Warning Colora- 

 tion. Resemblances between Insects occurring in Different Countries. 

 Mimicry possibly originated between forms much alike to start 

 with. Cases of apparently Useless Mimicry. Mimicry of Hymeno- 

 ptera by Volucella is Difficult to account for. Vision of Insects. 

 Cases of Mimicry in which the Mimicking Form is equally abundant 

 with the Model. Criticism of an apparent case of Mimicry. 

 Mimicry in some cases possibly only a Resemblance due to Affinity. 

 Mimicry among Mammals. Mimicry among Birds. Mimicry may 

 be in certain cases even Disadvantageous. Mimicry not always De- 

 ceptive. The Occasional Limitation of Mimicry to the Female Insect. 

 Mimicry between Unprotected Forms. Relative Unimportance of 

 the Imago Stage in Butterflies. Summary. . . . 



CHAPTER VI. 



XEXUA L COL ft. I TION. 



Sexual Dimorphism in Colour. Sexual Dimorphism of Colour most marked 

 in Birds and Butterflies. Slight Development of Colour Dimorphism 

 in Mammals. Dependence of Sexual Dimorphism from the Generat- 

 ing Laws. The Theory of Sexual Selection. Difficulty of Believing 

 in a highly -developed ^Esthetic Sense. ^Esthetic Sense of Butterflies. 

 Objections to the Theory of Sexual Selection. Excitability at Breed- 

 ing Season of Animals among which there is no Pairing. Some 

 arguments in favour of Sexual Selection. The Courtship of Spiders. 



Sexual Dimorphism partly due to a Need for Protection on the 

 part of the Female. Mr. Stoltzmann's Views. Mr. Wallace's Views. 



Summary . 



GENEBAL INDEX . 



TNDKX OF Au'niouV X \wr.s. 



