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Journal of Experimental Biology 83,325-333 (1979)
Published by Company of Biologists 1979

Haemolymph-Volume Changes in Rhodnius Prolixus During Flight

J. L. GRINGORTEN ¹ and W. G. FRIEND ²

¹ Department of Zoology, University of Toronto, Toronto, Ontario, Canada M5S 1A1; International Atomic Energy Agency P.O. Box 590, A-1011 Vienna, Austria.
² Department of Zoology, University of Toronto Toronto, Ontario, Canada M5S 1A1

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.