Haemolymph-Volume Changes in Rhodnius Prolixus During Flight

Abstract
Exhaustive flight in male Rhodnius prolixus Stål (Hemiptera: Reduviidae) can cause up to a 50% decrease in haemolymph volume. Insects urinate during the flight period which may account for this decrease. The percentage water in the haemolymph does not appear to change substantially during exhaustive flight.