Survey locations are displayed in red dots. The black rectangle shows the Agricultural Operations of the University of California, Riverside, where most of our surveys were conducted. Five Trissolcus hullensis were recovered from an alfalfa field (33.96508°N, 117.34084°W), one Trissolcus utahensis was recovered from a squash field with mustard weeds (33.96611°N, 117.34230°W), and eleven T. utahensis were recovered from roadside mustard weeds (33.99105°N, 117.33360°W).