CONTENTS. 



Page. 

 Chapter I. Intixxiuction, Maienal and Melhcxl 1. 



$ 1 Introduction 1. 



S S Material and Method 3. 



Chapter 11. Literature G. 



Chapter 111. On the Structure of the Thoracic Segments 20. 



Clmpter IV. On the Number of the Segments and on the Abdominal Legs. 27. 



Chapter V. Nomenclature and Primitive Pattern 30. 



Chapter VI. Systematic Synopsis of the Setal Pattern of Caterpillars . 47. 



(The following caterpillars are described in detail and 

 figured on Plate 1— V). 



tiepialus hectus 50. 



Hepialtts spec, cf luf»illinit 52. 



Coasus co$au». . 57. 



Zetuera pyrina 58. 



Pygaera bueephata 05. 



Lymantria dispar 71. 



Euproctia ckrytorhoea 73. 



Orgyia antiqua 77. 



Leuiocampa rubi 83. 



Bombyx mori 85. 



Salurnia pavonia 91. 



Sphitur ligustri 94. 



Smerinthus titaie 96. 



Smerinthus populi 97. 



Hypocrita jacobaea 99. 



Arctia caja 99 



Spilosoma lubricij)eda 101. 



Nonagria nervosa 103. 



Mamestra brassicae 103. 



Actxtnycta psi 103, 



Thyris fmestrella 107, 



Pieris brassicae 111. 



Pieris napi 115. 



Vanessa urticae 119, 



Sericinus telamon 121. 



Chapter VII. Comparison between the Patterns of Caterpillars and those 



of the Pupa, the Imago and other Larvae of Insects. 122. 

 Chapter VIII. General Considerations and Synopsis of the Results. , . 134. 



Bibliography 144. 



Explanations of Plates 152. 



