Bendiocarb was evaluated as an ULV cold aerosol against two species of caged mosquitoes, Anopheles quadrimaculatus and Aedes taeniorhynchus. Evaluations were made at flow rates of 60 ml/min and 120 ml/min at a vehicle speed of 16 kph, and 120 ml/min at a vehicle speed of 8 kph (equivalent to 240 ml/min at 16 kph). Good control was obtained at 5.6 and 11.2 g AI/ha at the highest treatment rate. Calculated effective dosages (ED) showed that as the flow rates increased the amount of active ingredient per hectare required for and ED-95 decreased. Mosquitoes maintained in the exposure cages had higher mortalities than those transferred to clean holding cages (our standard procedure) soon after exposure to the aerosol, reconfirming the necessity for routine transfer to prevent bias in results due to the effect of the residue in the exposure cages.