CONTENTS 



CHAPTER PAGE- 



I. The Common Red-Legged Grasshopper 1 



II. The Allies of the Red-Legged Grasshopper : Orthop- 



tera 15 



III. The Dragon Flies (Odonata) and the May Flies 



(Ephemerida) 24 



IV. The Cicadas, Plant Lice, and Scale Insects : Homoptera 30 

 V. The Bugs with Overlapping Wings : Hemiptera ... 39 



VI. The Beetles : Coleoptera 43 



VII. The Butterflies and Moths : Lepidoptera 54 



VIII. The Flies : Diptera 69 



IX. The Ants, Bees, and Wasps : Hymenoptera 77 



X. The Insects : Hexapoda 95 



XI. Classification and Distribution of Insects 107 



XII. Some of the Life Processes 117 



XIII. Living Matter : Protoplasm and the Cell 129 



XIV. The Spiders and Allies : Arachnida 137 



XV. The Crayfish 145 



XVI. The Jointed-Foot Animals : Arthropoda 157 



XVII. Heredity and Evolution 173 



XVIII. The Clam and Other Bivalves : Acephala 189 



XIX. Allies of the Acephala : Mollusca 207 



XX. The Starfish and Some Allies : Echinoderma .... 221 



XXI. An Earthworm 238 



XXII. Allies of the Earthworms : Annelida 251 



XXIII. Roundworms: Nemathelminthes 256 



XXIV. The Planarians, Flukes, and Tapeworms: Plathel- 



MINTHES (FLATWORMS) 261 



XXV. The Fresh- Water Polyp and Some Allies: Ccelen- 



terata , 267 



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