Early suggestions regarding the transmission of disease by insects. The ways in which arthropods may affect the health of man. CHAPTER II ARTHROPODS WHICH ARE DIRECTLY POISONOUS 6-56 The Araneida, or Spiders. The tarantulas. Bird spiders. Spiders of the genus Latrodectus. Other venomous spiders. Summary. The Pedipalpida, or whip-scorpions. The Scorpionida, or true scorpions. The Solpugida, or solpugids. The Acarina, or mites and ticks. The Myriapoda, or centipedes and millipedes. The Hexapoda, or true insects. Piercing or biting insects poisonous to man. Hemiptera, or true bugs. The Notonectidæ or back-swimmers. Belostomidæ or giant water-bugs. Reduviidæ, or assassin bugs. Other Hemiptera reported as poisonous to man. Diptera; the midges, mosquitoes and flies. Stinging insects. Apis mellifica, the honey bee. Other stinging forms. Nettling insects. Lepidoptera, or butterflies and moths. Relief from poisoning by nettling larvæ. Vescicating insects and those possessing other poisons in their blood plasma. The blister beetles. Other cryptotoxic insects. CHAPTER III PARASITIC ARTHROPODS AFFECTING MAN 57-130 Acarina, or mites. The Trombidiidæ, or harvest mites. The Ixodoidea, or ticks. Argasidæ. Ixodidæ. Treatment of tick bites. The mites. Dermanyssidæ. Tarsonemidæ. Sarcoptidæ, the itch mites. Demodecidæ, the follicle mites. Hexapoda, or true insects. Siphunculata, or sucking lice. Hemiptera. The bed-bug. Other bed-bugs. Parasitic Diptera, or flies. Psychodidæ, or moth flies. Phlebotominæ. Culicidæ, or mosquitoes. Simuliidæ, or black-flies. Chironomidæ, or midges. Tabanidæ, or horse-flies. Leptidæ or snipe-flies. Oestridæ, or bot-flies. Muscidæ, the stable-fly and others. Siphonaptera, or fleas. The fleas affecting man, the dog, cat, and rat. The true chiggers, or chigoes. CHAPTER IV ACCIDENTAL OR FACULTATIVE PARASITES 131-143 Acarina, or mites. Myriapoda, or centipedes and millipedes. Lepidopterous larvæ. Coleoptera, or beetles. Dipterous larvæ causing myiasis. Piophila casei, the cheese skipper. Chrysomyia macellaria, the screw-worm fly. Calliphorinæ, the bluebottles. Muscinæ, the house or typhoid fly, and others. Anthomyiidæ, the lesser house-fly and others. Sarcophagidæ, the flesh-flies. CHAPTER V ARTHROPODS AS SIMPLE CARRIERS OF DISEASE 144-163 The house or typhoid fly as a carrier of disease. Stomoxys calcitrans, the stable-fly. Other arthropods which may serve as simple carriers of pathogenic organisms. CHAPTER VI ARTHROPODS AS DIRECT INOCULATORS OF DISEASE GERMS 164-174