The northern scorpion, Paruroctonus boreus (Girard 1854) is recorded from big sage climax, sand dune, cheatgrass dominated, and partially disturbed big sage habitats on the Hanford Nuclear Site, located in southcentral Washington State. Based on a pitfall trapping survey, the species was most commonly encountered in partially disturbed big sage habitat and rarely found in cheatgrass dominated plant communities. A total of 127 specimens were taken with the earliest collection made 20–28 March and the latest 9–24 October. Habitat occurrence on the Hanford Site is compared with comparable studies at other locations. The possible negative effect of cheatgrass invasion on scorpion occurrence is discussed.
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Vol. 88 • No. 3