xn CONTEXTS 



CHAPTER IX 



WARNING COLORATION AND I^IIMICRY 



The skunk as an example of warning coloration — Warning colours among 

 insects — Butterflies — Caterpillars — Mimicry — How mimicry has been 

 produced — Heliconidse — Perfection of the imitation — Other cases of 

 mimicry among Lepidoptera — Mimicry among protected groups — Its 

 explanation — Extension of the principle— Mimicry in other orders of 

 insects — Mimicry among the vertebrata — Snakes — The rattlesnake and 

 the cobra — Mimicry among birds — Objections to the theory of mimicry 

 — Concluding remarks on warning colours and mimicry 



Pages 232-267 



CHAPTER X 



COLOURS AND ORNAMENTS CHARACTERISTIC OF SEX 



Sex colours in the mollusca and crustacea^In insects — In butterflies and 

 moths — Probable causes of these colours — Sexual selection as a 

 supposed cause — Sexual coloration of birds — Cause of dull colours of 

 female birds — Relation of sex colour to nesting habits— Sexual colours 

 of other vertebrates — Sexual selection by the struggles of males — 

 Sexual characters due to natural selection — Decorative plumage of 

 males and its effect on the females — Display of decorative plumage 

 by the males — A theory of animal coloration — The origin of accessory 

 plumes — Development of accessory plumes and their display — The 

 effect of female preference will be neutralised by natural selection — 

 General laws of animal coloration — Concluding remarks . 268-300 



CHAPTER XI 



THE SPECIAL COLOURS OF PLANTS : THEIR ORIGIN 

 AND PURPOSE 



The general colour relations of plants— Colours of fruits— The meaning of 

 nuts— Edible or attractive fruits— The colours of flowers— Modes of 

 securing cross-fertilisation— The interpretation of the facts— Summary 



