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The eucoiline genus Hexacola Foerster, 1869 is present in the Afrotropical, Neotropical, Holarctic and Ethiopian regions, as well as Oceania. In this paper, three species are reported for the first time in Argentina: Hexacola hexatoma (Hartig 1841), Hexacola bifarium Quinlan, 1986 and Hexacola bonaerensis Reche, nom. nov. proposed to replace Hexacola fuscipes (Kieffer 1908) by homonymy with Hexacola fuscipes (Kieffer 1907). Their redescriptions are provided. Species from Argentina are parasitoids of Ephydridae and Chloropidae (Diptera). New distribution data, new host records and a key for Argentinian species are provided. Photographs of diagnostic characters and georeference of locality of collections are included. The material examined is deposited in the collection of the División Entomología, Museo de La Plata (Argentina).

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Trapdoor spiders are known for digging deep burrows into the ground closed with a thick trapdoor. Actinopus balcarce Ríos-Tamayo & Goloboff was described based on two males from Balcarce, Buenos Aires, Argentina. In a recent survey in the type locality, we found females probably belonging to this species. Morphology of the females found allowed us to attribute them to Actinopus balcarce, which are described for the first time. Photographs of the spermathecae are presented along with comments on the natural history of the species. Some morphological insights on the female of this species are also discussed.