The nonbiting flies are probably responsible for the transmission of the causative agents of many more cases of enteric bacterial infections, of all types, than are biting flies, including mosquitoes. Certainly this is true in the United States where infection rates, if not disease, are low in comparison to those of the rest of the world. From surveys conducted in New Mexico, Georgia, Puerto Rico, and New York City, Watt & Hardy (1) showed that Shigella infections predominated, their studies indicating total reported or estimated annual morbidity rates of 48 per cent in New Mexico, 20 per cent in Georgia, 60 per cent in Puerto Rico, and "markedly less" in New York City. They also found that

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