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The Papuan rove-beetles Megarthrus auricola sp. nov. and Megarthrus primus sp. nov. are described. Records of these species extend the known distributional range of the genus to the south beyond Wallace's line. Observations were made on M. auricola which appeared to load water on to the dorsum. Complex morphological structures are involved which are briefly described. Subsequently, this behaviour was also observed in five other species of Proteininae and one of Omaliinae.