PREFACE. IX 



ADDITIONS AND CORRECTIONS TO THE ESSAYS AS 

 ORIGINALLY PUBLISHED. 



Essays I. and II. are unaltered, but short notes are 

 added at pp. 19, 24, 29, and 40. 



III. Mimicry, and other Protective Resemblances 

 among Animals. 



PAGE 



53 Additional illustration of protective colouring in 



the case of the wood-dove and the robin. 

 63 On moths resembling bird's dung and mortar. 

 86 Correction of some names of African Papilios and 



a reference to Mr. Trimen's observations. 

 89 Mr. Jenner Weir's observation on birds which 



refused to eat Spilosoma menthrasti. 

 102 An additional case of snake mimicry in Oxyrhopus 



trigeminus. 



107 Mr. Salvin's case of mimicry among hawks. 

 113 Name, Diadema anomala, added. 

 117 to 122. Use of gay colours in caterpillars, with an 

 account of Mr. Jenner Weir's and Mr. Butler's 

 observations. 



IV. The Malayan Papilionidce or Swallow-tailed 

 Butterflies y as illustrative of the Theory of Natural 

 Selection. 



135 to 140. Additions to the discussion on the rank of 

 the Papilionidse, and on the principles which 

 determine the comparative rank of groups in the 

 animal kingdom. 



