CONTENTS 



PACK 



DEDICATION v 



PREFACE vii 



INTRODUCTION ix 



INTRODUCTORY LETTER FROM THE LATE FRED- 

 ERIC M. HALFORD . . between pp. xiv and xv 



LIST OF PLATES xvii 



LIST OF ILLUSTRATIONS xix 



PART I 



CHAPTER I. THE COLLECTION AND PRESERVA- 

 TION OF WATER INSECTS I 



CHAPTER II. THE DETERMINATION OF GENERA 



AND SPECIES 7 



CHAPTER III. CLASSIFICATION OF THE TRICH- 



OPTERA 16 



PART II 

 THE EPHEMERIDJE 22 



PART III 

 THE TRICHOPTERA 40 



XV 



