| Summary: | Two species of <i>Psilochalcis</i> (Hymenoptera: Chalcididae) wasps occurring in the Great Basin region of the western United States were sampled from three locations in central Utah (USA) over a two-year period using Malaise traps. Each location is composed of four contiguous habitat types: pinyon/juniper (<i>Pinus edulis</i> or <i>P. monophylla</i> and <i>Juniperus osteosperma</i>), sagebrush (<i>Artemisia tridentata)</i>, cheatgrass (<i>Bromus tectorum</i>), and crested wheatgrass (<i>Agropyron cristatum)</i>. Seasonal trap abundance for each <i>Psilochalcis</i> species was determined. <i>Psilochalcis minuta</i> Petersen and <i>Psilochalcis quadratis</i> Petersen occur in highest abundance from mid-May to early August. <i>Psilochalcis minuta</i> demonstrates a significant association with pinyon/juniper habitat, specifically at the Utah; Juab County, Yuba Valley sample site, whereas <i>P. quadratis</i> demonstrates a significant association with cheatgrass (<i>Bromus tectorum</i>) habitat at the same location.
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