Two new species in the genus Theridion Walckenaer 1805 (Araneae: Theridiidae) are described: T. logan, sp. nov., from Utah, USA, and T. pierre, sp. nov., from South Dakota, USA. Diagnoses, descriptions and habitat notes are provided for both sexes of these new species. Both species are from open, grassland-type habitats.
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Vol. 41 • No. 3