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This is a myrmecophilous genus of Syrphidae with three species. Adult flies mimic wasps and fly larvae feed as scavengers in the nests of ants. They are native from the southern United States to northern Argentina.

List of Rhopalosyrphus and their Host Ants
Genus and species Author and Year Ant Host Distribution Notes
Rhopalosyrphus guentherii (Lynch Arribálzaga, 1891) ants Argentina, Brazil, Costa Rica, Guatemala, Mexico, Paraguay, Peru; United States: Arizona, Alabama, Texas
Rhopalosyrphus australis Thompson, 2003 Paraguay
Rhopalosyrphus ramulorum Weems & Deyrup, 2003 Pseudomyrmex ejectus, Pseudomyrmex simplex Mexico; United States: Alabama, Florida


  • Weems, H. V., Jr., Thompson, F. C., Rotheray, G. & Deyrup, M. A. 2003. The genus Rhopalosyrphus (Diptera: Syrphidae) (Diptera: Syrphidae). Florida Entomologist 86: 186-193.