Abstract
1. 1. Water metabolism in Liomys irroratus and L. pictus was studied by measuring water loss and gain by several routes. 2. 2. Urine concentrations and fecal water contents were similar in the two species; L. pictus experiences significantly higher evaporative water loss than does L. irroratus. 3. 3. Observed differences in water loss between the two species are largely a function of parameters related to weight-specific metabolic rate; the differential water losses are offset by differences in metabolic water production and ease of obtaining free water, so that the two species appear equally capable of attaining water balance. 4. 4. The physiological characteristics of these two species are discussed relative to their respective ecological distributions and to a current hypothesis about the evolution of Liomys.
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