Determination of oxygen consumption a t 20 ± 1 °C was made in nymphs of the dragonflySomatochlora cingulata.Three methods of measuring oxygen uptake rates were compared with respect to reproducibility and sensitivity. A flow-through regime, employing chemical titration of oxygen yielded the most reproducible results, though titration is not as sensitive as manometric based procedures. The Gilson respirometer and static chemical titration procedures were both more variable.