Abstract
1. 1. The temperature and water relations of Centruroides hentzi females were investigated. At 12 and 72% relative humidity (RH), the lower and upper Lt 50 were -4.5 and 43.7°C, and -4.7 and 45.1°C, respectively. When exposed to high temperature stress, survivorship was significantly greater under mesic conditions. 2. 2. Cuticular water loss was higher under xeric conditions (12% RH), ranging from 0.061 mg/cm 2/hr at 30°C to 0.211 at 41°C. 3. 3. Exposure to dry air (0–5% RH) resulted in a significant increase in hemolymph osmolality: from 441 to 688 mOsm over a 5 day period. 4. 4. Mean oxygen consumption rates increased from 161.7 mm 3/g/hr at 34°C to 541.6 at 44°C. ATPase activity was significantly higher in animals acclimated and tested at 35°C.
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