Abstract
1. 1. Transpiration rates were inversely related to body weight, directly related to surface area between 35 and 40° in large specimens and increased with death in Orthoporus ornatus. 2. 2. Increased activity accounted for marked increases in transpiration between 35 and 40°C, as did increased cuticular permeability in large specimens. 3. 3. Forced coiling reduced transpiration at 40°C but not at 30°C. 4. 4. Ingestion of succulent food enabled maintenance of body weight in dry air. 5. 5. Desiccated specimens did not absorb moisture across the cuticle from saturated air or water, but anal as well as oral water uptake was demonstrated from moist substrates. 6. 6. Desiccation resistance in O. ornatus is considerably greater than in millipedes previously studied.
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