Abstract
1. 1. Total transpiration varied from 1.13 mg cm −2 hr −1 at T a = 25°C to 6.07 mg cm −2 hr −1 at 45°C. At any given temperature cuticular transpiration was not significantly different. These rates were higher than any desert insect but not unusual when compared with those of other terrestrial arthropods. 2. 2. Oxygen consumption showed little change between 25 and 35°C but had a Q 10 of about 2 between 15 and 25 and between 35 and 40°C. 3. 3. Growth rates increased with increasing T a to a maximum of 2.3 g/day at 30°C and declined at higher T a . 4. 4. Heart rates are tightly coupled to body temperature and were similar at a given T b during heating and cooling. 5. 5. The present study gives no indication of physiological control of T b or any special adaptations of M. sexta to hot, dry environments.
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