نبذة مختصرة : Poecilopompilus costatus oenochrous (Schultz) ARGENTINA: Buenos Aires Province, Magdalena; 4 December 2022, 3:06 PM; M. Arregui. Host: Araneus lathyrinus (Holmberg) (Araneidae), adult or subadult female. The wasp stood on a leaf above ground level grasping the immobilized orb-weaver by the base of its left foreleg with her mandibles, retaining it in a perpendicular position (Fig. 14; Arregui 2023). This is the first host record for Poecilopompilus costatus oenochrous , Araneus lathyrinus , which is the typical host spider family for most species in this genus (Kurczewski et al. 2020, 2022b). ARGENTINA: Santa Fe Province, Nueve de Julio County; 3 March 2023, 1703 PM; I. M. Churruarin. Host: Ocrepeira venustula (Keyserling) (Araneidae), adult female. The wasp, clinging upside down to an upright narrow stem, held the orb-weaver cephalothorax upward, grasping the base of its left foreleg with her mandibles (Churruarin 2023). Ocrepeira venustula (Keyserling) (Araneidae) is a new host genus and species for Poecilopompilus costatus oenochrous. This is the second host record for P. costatus oenochrous. ; Published as part of Kurczewski, Frank E., West, Rick C. & Waichert, Cecilia, 2024, New host records for Nearctic and Neotropical spider wasps (Hymenoptera: Pompilidae), pp. 1-32 in Insecta Mundi 2024 (34) on page 19, DOI: 10.5281/zenodo.10793331
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