Studies on the effect of humidity on longevity ofCryptotermes brevis(Walker) revealed that groups lived longer than isolated individuals. Average longevity (50-day test) was 23.9 days for groups of 10 and 15.7 for isolated pseudogates when held over salt solutions in individual desiccators (5–96% RH, 25±1°C) to stabilize humidities. Average maximum longevity (122-day test) was 44.0 days for groups of 10 and 23.3 days for isolated pseudogates when held over sulfuric acid solutions (9–98% RH, 25± 1°C). Pseudogates generally lived longer at high humidities (87–98% RH) but sometimes showed temporary symptoms of water poisoning. Altruistic behavior of proctodeal and stomodeal feeding was prevalent in pseudogates at low humidities (5–7% RH).Humidity gradient preference investigations revealed a clumping behavior that was intensified in darkness. The minimum number of pseudogates required to demonstrate clumping was between five and 10. Preconditioning three hours in stabilized desiccating environment (9–11% RH) elicited pseudogate movement toward increased humidity (87–98% RH).