Insects and their ways -- The anatomy, physiology, and development of insects -- Systematics, classification, nomenclature, and identification -- Behavior and ecology -- Phylum arthropoda -- Hexapoda -- The entognathous hexapods : Protura, collembola, diplura -- The apterygote insects : Microcoryphia and thysanura -- Order ephemeroptera : Mayflies -- Order odonata : Dragonflies and damselflies -- Order orthoptera : Grasshoppers, crickets, and katydids -- Order phasmatodea : Walkingsticks and leaf insects -- Order grylloblattodea : Rock crawlers -- Order mantophasmatodea -- Order dermatera : Earwigs -- Order plecoptera : Stoneflies -- Order embiidina : Web-spinners -- Order zoraptera : zorapterans, angel insects -- Order isoptera : Termites -- Order mantodea : Mantids -- Order blattodea : Cockroaches -- Order hemiptera : True bugs, cicadas, hoppers, phyllids, whiteflies, aphids, and scale insects -- Order thysanoptera : Thrips -- Order Psocoptera : Psocids -- Order Phthiraptera : Lice -- Order coleoptera : beetles -- Order neuroptera : Alderflies, dobsonflies, fishflies, snakeflies, lacewings, antlions, and owlflies -- Order hymenoptera : Sawflies, parasitic wasps, ants, wasps, and bees -- Order trichoptera : Caddisflies -- Order lepidoptera : Butterflies and moths -- Order siphonaptera : Fleas -- Order mecoptera : Scorpionflies and hangingflies -- Order strepsiptera : Twisted-wing parasites -- Order diptera : Flies -- Collecting, preserving, and studying insects