Abstract
Summary Lasioglossum versatum , a bee whose colonies occur in small, dense aggregations, shows tolerance and some interactions among individuals of different colonies and thus social activity at a level above that usual among social insects. Guards admit individuals from any colony. Burrows made by different colonies sometimes interconnect. Most or all workers are attached primarily to one colony but often enter others. When they do so, they frequently leave immediately but may remain and may leave pollen loads, probably being stimulated to do so by cues such as they would encounter in their own nests. The result must be a certain degree of cooperative interaction among colonies. However, advantages of such interaction are not obvious and visits to wrong nests probably result from errors in nest recognition.
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