EMBRYOLOGY—EGGS—MICROPYLES—FORMATION OF EMBRYO—VENTRAL PLATE—ECTODERM AND ENDODERM—SEGMENTATION—LATER STAGES—DIRECT OBSERVATION OF EMBRYO —METAMORPHOSIS—COMPLETE AND INCOMPLETE—INSTAR—HYPERMETAMORPHOSIS —METAMORPHOSIS OF INTERNAL ORGANS—INTEGUMENT—METAMORPHOSIS OF BLOWFLY —HISTOLYSIS—IMAGINAL DISCS—PHYSIOLOGY OF METAMORPHOSIS—ECDYSIS 143 CHAPTER VI CLASSIFICATION—THE NINE ORDERS OF INSECTS—THEIR CHARACTERS—PACKARD'S ARRANGEMENT—BRAUER'S CLASSIFICATION—CLASSIFICATIONS BASED ON METAMORPHOSIS—SUPER-ORDERS—THE SUBDIVISIONS OF ORDERS 171 CHAPTER VII THE ORDER APTERA—DEFINITION—CHIEF CHARACTERISTICS—THYSANURA—CAMPODEA —JAPYX—MACHILIS—LEPISMA—DIVERSITY OF INTERNAL STRUCTURE IN THYSANURA —ECTOTROPHI AND ENTOTROPHI—COLLEMBOLA—LIPURIDAE—PODURIDAE —SMYNTHURIDAE—THE SPRING—THE VENTRAL TUBE—ABDOMINAL APPENDAGES —PROSTEMMATIC ORGAN—TRACHEAL SYSTEM—ANURIDA MARITIMA—COLLEMBOLA ON SNOW—LIFE-HISTORIES OF COLLEMBOLA—FOSSIL APTERA—APTERYGOGENEA —ANTIQUITY AND DISTRIBUTION OF CAMPODEA 180 CHAPTER VIII ORTHOPTERA—FORFICULIDAE, EARWIGS—HEMIMERIDAE 198 CHAPTER IX ORTHOPTERA _CONTINUED_—BLATTIDAE, COCKROACHES 220 CHAPTER X ORTHOPTERA _CONTINUED_—MANTIDAE, SOOTHSAYERS 242 CHAPTER XI ORTHOPTERA _CONTINUED_—PHASMIDAE, WALKING-LEAVES, STICK-INSECTS 260 CHAPTER XII ORTHOPTERA _CONTINUED_—ACRIDIIDAE, LOCUSTS, GRASSHOPPERS 279 CHAPTER XIII ORTHOPTERA _CONTINUED_—LOCUSTIDAE, GREEN GRASSHOPPERS, KATYDIDS 311 CHAPTER XIV ORTHOPTERA _CONTINUED_—GRYLLIDAE, CRICKETS 330 CHAPTER XV NEUROPTERA—MALLOPHAGA—EMBIIDAE 341 CHAPTER XVI NEUROPTERA _CONTINUED_—TERMITIDAE, TERMITES OR WHITE ANTS 356 CHAPTER XVII NEUROPTERA _CONTINUED_—PSOCIDAE (BOOK-LICE AND DEATH-WATCHES)—THE FIRST FAMILY OF AMPHIBIOUS NEUROPTERA (PERLIDAE, STONE-FLIES) 390 CHAPTER XVIII AMPHIBIOUS NEUROPTERA _CONTINUED_—ODONATA, DRAGON-FLIES 409 CHAPTER XIX AMPHIBIOUS NEUROPTERA _CONTINUED_—EPHEMERIDAE, MAY-FLIES 429 CHAPTER XX NEUROPTERA PLANIPENNIA—SIALIDAE, ALDER-FLIES, SNAKE-FLIES—PANORPIDAE, SCORPION-FLIES—HEMEROBIIDAE, ANT-LIONS, LACEWINGS, ETC. 444 CHAPTER XXI NEUROPTERA _CONTINUED_—TRICHOPTERA, THE PHRYGANEIDAE OR CADDIS-FLIES 473 CHAPTER XXII HYMENOPTERA—HYMENOPTERA SESSILIVENTRES—CEPHIDAE—ORYSSIDAE—SIRICIDAE —TENTHREDINIDAE OR SAWFLIES 487 CHAPTER XXIII HYMENOPTERA PETIOLATA—PARASITIC HYMENOPTERA—CYNIPIDAE OR GALL-FLIES —PROCTOTRYPIDAE—CHALCIDIDAE—ICHNEUMONIDAE—BRACONIDAE—STEPHANIDAE —MEGALYRIDAE—EVANIIDAE—PELECINIDAE—TRIGONALIDAE 519 INDEX 567