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The urine of blood-fed adults of Aedes aegypti (L.) was collected and analysed for elemental composition and osmolality. Peak rates of urine flow averaged 4.9 droplets/min at 6 min following the beginning of the blood-meal; peak flow urine contained, in msmallcap˜M, Na 178, K 4 and Cl 132, and the urine was approximately isosmotic to haemolymph. As urine flow rates fell the [Na] of the urine decreased and the [K] increased. Urine osmolality declined, measuring less than 100 mOsm/kg in some samples as compared to 354 mOsm/kg measured in pre-blood-meal haemolymph. When urine flow rates had fallen to less than 10% of peak flow rates, urine again became approximately isosmotic to haemolymph, still containing Na and K as the principal cations. Approximately 40% each of the water, Na and Cl contained in the plasma fraction of the blood-meal was excreted during the 1-2-h period following the blood …