Sanford D. Porter, Marcos A. Pesquero, Illustrated Key to Pseudacteon Decapitating Flies (Diptera: Phoridae) That Attack Solenopsis saevissima Complex Fire Ants in South America, The Florida Entomologist, Vol. 84, No. 4 (Dec., 2001), pp. 691-699
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Porter et al. (2001) studied this question.