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During our long-term investigations on colony interactions and communication in the harvester ants (Pogonoymrmex) in the Chihahuan desert near Portal, Arizona and Rodeo, New Mexico, we occasionally observed interspecific, mixed colonies of P. rugosus and P. barbatus. In all cases it appeared that P. barbatus workers were incorporated into a P. rugosus nest, because P. barbatus were by far in the minority. We first noted this phenomenon in July 1974, when we encountered a P. rugosus nest, wheredoi:10.1155/1989/47982 fatcat:ruckrnkqtvhkjdu3ldll4zqalm