Transcriber Note Emphasized text represented as _Italic_. Whole and fractional part of numbers: 1-3/4. [Illustration: The Dragon-fly (_Libellula depressa_). A. Perfect Insect. B. Perfect Insect emerging from the Pupa. C. D. Larvæ and Pupæ.] THE INSECT WORLD: BEING _A Popular Account of the Orders of Insects_; TOGETHER WITH A DESCRIPTION OF THE HABITS AND ECONOMY OF SOME OF THE MOST INTERESTING SPECIES. BY LOUIS FIGUIER. A New Edition, REVISED AND CORRECTED BY P. MARTIN DUNCAN, F.R.S. WITH 579 ILLUSTRATIONS. D. APPLETON AND CO., _NEW YORK_. PREFACE This popular French book on Insects has been placed in my hands in order that the scientific portions of it should be examined and, if necessary, corrected. This task has been a light one, for the book had already passed through the able editorship of Mr. Jansen. But I have added a short notice of the Thysanoptera, which did not appear in M. Figuier's original work, and also the necessary information respecting the evolution of Stylops. P. MARTIN DUNCAN. LEE, 1872. CONTENTS. PAGE INTRODUCTION 1 APTERA 27 DIPTERA 33 Nemocera 35 Brachycera 47 HEMIPTERA 90 Heteroptera 90 Homoptera 101 LEPIDOPTERA 138 The Larva, or Caterpillar 138 The Chrysalis, or Pupa 146 The Perfect Insect 165 ORTHOPTERA 284 HYMENOPTERA 313 THYSANOPTERA 400 NEUROPTERA 402 COLEOPTERA 435 INDEX 523 THE INSECT WORLD. INTRODUCTION.