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Ectatomma opaciventre Roger is a species of ant whose prey includes species of flies, however, the behaviors employed by workers in their predation were not known. In this article, an ethogram of predation on larvae and adults of the fly Hermetia illucens L. by workers of E. opaciventre was elaborated. Individuals were collected from three E. opaciventre nests and later transferred to artificial nests. For each of them, live fly larvae and adults were offered. From the observations, in a context of predation, observed behaviors that had similar functions were grouped into categories, with four of them having been observed in predation on larvae and all eight in predation on adults. The larvae were not actually preyed on (the aggressive behavior performed by the ants appears to be related to nest defense), but the adult flies, in fact, served as food. [ABSTRACT FROM AUTHOR]