This study aims to describe and analyze the colonization of Aedes albopíctus whose presence was detected in 1991 in the area of São José do Rio Preto already colonized by the Aedes aegypti. Yea and month of occwrence, counties, composition and location of larval samples, kinds of containers, average number of larvae an Breteau Index have been analyzed from the information obtained in measurements of larval density by Superintendência de Controle de Endemias (SUCEN). The presence of Aedes albopíctus was ascertained in 34 towns up to December 1994. The colonization of the area by the mosquito is still reduced showing some differences in relation to Aedes aegypti such as greater ratio outdoors, occupying container in different proportions. The average number of Aedes albopíctus lan'ae has had influence of larvae of another species. It has showed a seasonal behavior similar to Aedes aegypti and it has moved from east to west direction.
Aedes; Aedes albopíctus; Colonization; Ecology