. Introduction to zoology; a guide to the study of animals, for the use of secondary schools;. f northern United States . 315 CHAPTER XX THE MOUSE AND ITS ALLIES 318 APPENDIX : Key to the orders of Mammalia .... 331 CHAPTER XXI THE DEVELOPMENT OF THE FROGS EGG . . 332 xil CONTENTS APPENDIX I PAGE OUTLINE OF LABORATORY WORK IN ZOOLOGY .... 337 INTRODUCTION .......... 337 EXERCISES 342 I. Grasshopper 342 II. Butterfly . 343 III. Beetle 344 IV. Housefly or Bluebottle Fly 345 V. Lithobius 347 VI. Spider 348 VII. Crayfish 349 VIII. Daphnia 351 IX. Earthworm . 352 X. Nereis 353 XI. Slug 354 XII. Fre
. Introduction to zoology; a guide to the study of animals, for the use of secondary schools;. f northern United States . 315 CHAPTER XX THE MOUSE AND ITS ALLIES 318 APPENDIX : Key to the orders of Mammalia .... 331 CHAPTER XXI THE DEVELOPMENT OF THE FROGS EGG . . 332 xil CONTENTS APPENDIX I PAGE OUTLINE OF LABORATORY WORK IN ZOOLOGY .... 337 INTRODUCTION .......... 337 EXERCISES 342 I. Grasshopper 342 II. Butterfly . 343 III. Beetle 344 IV. Housefly or Bluebottle Fly 345 V. Lithobius 347 VI. Spider 348 VII. Crayfish 349 VIII. Daphnia 351 IX. Earthworm . 352 X. Nereis 353 XI. Slug 354 XII. Fresh-water Clam 356 XIII. Starfish 357 XIV. Hydra 358 XV. Paramecium . . . . 359 XVI. Smelt 361 XVII. Newt 362 XVIII. Lizard 363 XIX. English Sparrow 364 XX. Mouse 365 XXI. Development of the frogs egg 366 METHODS OF EXAMINATION 367 APPENDIX II A LIST ov BOOKS DEALING CHIEFLY WITH THE ECOLOGICAL AND SYSTEMATIC ZOOLOGY OF AMERICAN ANIMALS .... 369 APPENDIX III SYNOPSIS OF THE ANIMAL KINGDOM ...... 383 GLOSSARY . 391 I^NDEX .,»,».••>••> out INTEODUCTION TO ZOOLOGY. INTRODUCTION TO ZOOLOGY CHAPTER I THE GRASSHOPPER AND ITS ALLIES Relationships. — The grasshopper belongs to an orderof insects called In this group of insects2there is an incomplete metamorphosis during development,so that the general form of the young resembles that ofthe adult. The anterior and posterior pairs of wings areunequal. The jaws are adapted for biting. The name grasshopper is applied to two families ofinsects; namely, the Acridida^8 and the Loeustidse. Bothof these families have long hind legs, used in jumping, anelongated body flattened from side to side, and a wedge-shaped head directed downward ; they differ in the lengthof the antennae. -The Acrididae, or short-horned grasshoppers,are found in both hemispheres. They live, for the mostpart, on the ground in very diverse conditions, such as inlow, damp meadows or in dry uplands, arid deserts, androcky mountain sides
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