Abstract
Current knowledge concerning the occurrence, distribution, and mechanism of the insect discontinuous ventilation cycle, or DVC, is evaluated in the light of recent data. The congruence between the emerging body of data and the generally accepted theoretical understanding of the DVC, the modulation of the DVC to accommodate varying metabolic rates, the mass scaling characteristics of the DVC, and general issues concerning the measurement and quantification of the DVC are discussed. In addition, new experimental data on respiratory water loss during the open-spiracle and fluttering-spiracle phases are described.

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