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Although fire ants have been extensively studied, not much has been published about the structure and building material of their nests and even less on the lining of chamber walls. Nests built in unconsolidated sandy soils of Solenopsis electra and Solenopsis nr. macdonaghi, studied in La Pampa and Chubut (Argentina), respectively, show organic linings, which are reported herein for the first time...
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