Attempts at control and eradication of Aedes aegypti (L.) are almost invariably based on the assumption that the mosquito is absolutelydomestic, or at least is confined to man-made breeding places. Habitats described for larvae include all types of domestic containers, i. e., tin cans, buckets, bowls, etc., automobile tires, concrete drains, artificial pools, and dozens of other water-holding articles which have been created by mankind. That a program involving the complete eradication of Aedes aegypti by eliminating water-holding articles is not all-inclusive, even with adequate inspection of domestic premises and human modifications of natural situations, has been repeatedly proven in West Africa.