The dispersal of post-teneral female Culex salinarius was studied near a brackish water breeding source in southwestern Louisiana. An estimated 4,000, 8,000 and 22, mosquitoes were marked with fluorescent pigments in 3 mark-release-recapture experiments conducted in 1980 and 1981. Mosquitoes were collected over a 26-hr period following release. Thirteen marked Cx. salinarius were recovered in all directions from the release point at distances of up to 2,000 m on the night of release and 1,000 m on the following night. Single specimens of Aedes vexans and Anopheles sp. were recovered at 1,000 m on the night of release.