In southern Florida the immature stages of the mosquito Wyeomyia vanduzeei Dyar and Knab are found predominantly in water held in the leaf axils of bromeliads. As part of a study of the factors controlling mosquito population size, we developed a method for sampling the immature stages (eggs, larvae and pupae) and used it here in laboratory studies to determine the influence of plant size and presence of water in the leaf axils on the number of eggs laid. The presence of organic infusion and of organic debris in bromeliad leaf axils did not appear to be of any importance in influencing oviposition.