CONTENTS. 



CHAP. P4GH 



INTRODUCTION 1 



I. THE DISTINGUISHING CHAEACTEBS OF INSECTS . 14 

 II. THE EXTERNAL STRUCTURE OF INSECTS ... 24 



III. THE WINGS OF INSECTS, AND THEIR CLASSI- 



FICATION 40 



IV. THE CHANGES OF INSECTS 55 



V. COLEOPTERA 63 



VI. COLEOPTERA (continued) 86 



VIL EUPLEXOPTERA 109 



VILL ORTHOPTERA 113 



IX. THTSANOPTERA 123 



X. NEUROPTERA . . . 126 



XI. TRICHOPTERA 146 



XII. HYMENOPTERA 152 



XIII, HYMENOPTERA (continued} TEREBRANTIA . . 155 



