Abstract
IN a study of the utilization of mud by mud-dauber wasps, kiln-firing has been investigated as a technique for quick identification of the mud sources used by the wasps. Sceliphron cementarium (Drury) has been found to construct nests using radioactive mud from the waste disposal pits on the Atomic Energy Reservation at the Oak Ridge National Laboratory. Trypoxylon politum (Say) seldom used radioactive mud, although it nested in the same sites as Sceliphron1. Information about the kinds of mud used, and the sources of such muds, was necessary for interpreting the behaviour of the wasps in this unique situation.
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