The exotic mosquito, Aedes bahamensis, is now well-established in south Florida, where it is widely distributed throughout Dade and southern Broward Counties in both urban and rural areas east of the Everglades. When discarded automobile tires were sampled in areas near human habitation, larvae and pupae of Ae. bahamensis were frequently found in association with immature Ae. aegypti. Elsewhere, however, Ae. bahamensis generally occurred in the absence of Ae. aegypti. The persistence of Ae. bahamensis populations at specific sites was documented in egg collections from ovitraps and in larval samples from the water retained in discarded tires.