A set of seven experiments was conducted under laboratory conditions to determine the respective influence of larval-produced attractants or stimulants, microbial activity and chemicals of environmental origin on the oviposition site selection by Aedes atropalpus, a rock-pool mosquito. The more definitive responses were obtained with the larval holding waters. Mosquito larvae of the same species act as oviposition attractants or stimulants; this larval effect is persistent at room temperature and Ae. atropalpus females do not distinguish between Ae. atropalpus and Ae. communis larval holding waters. Statistical analysis (ANOVA) indicates no interaction between the larval factor and the tested environmental factors.