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Transpiration rates in dry air (20% RH) were measured in 15 orthognathous spider species (Mesothelae, Mygalomorphae) from Thailand and Burma. The mean weight losses range between 0.1 and 1.9% body weight per hour; they are mostly highter than data from related spiders in the literature. Differences between the species are discussed. Web and burrow architecture of the species, and to a lesser extent their geographical distribution, reflect the specific water relations.