“…I examined the literature for published records of Chelostoma in Montana (e.g., Michener 1938, Hurd & Michener 1955, Kuhlman & Burrows 2017, Reese et al 2018, Glenny et al 2018, Burkle & Runyon 2019), and for records of C. campanularum and C. rapunculi in North America (e.g., Eickwort 1981, Buck et al 2005, Bartomeus et al 2013a, Normandin et al 2017, Tonietto et al 2017, Choate et al 2018, Jamieson et al 2019, Decker et al 2020, Kilpatrick et al 2020, Veit et al 2022). Specimens were examined from the Montana Entomology Collection (MTEC), Montana State University, Bozeman, Montana, U.S.A. (Michael A. Ivie), the U.S. National Pollinating Insects Collection (BBSL), USDA Agricultural Research Service Pollinating Insect Research Unit, Utah State University, Logan, Utah, U.S.A. (Terry Griswold), and the research collection of Laura A. Burkle, Ecology Department, Montana State University, Bozeman, Montana, U.S.A.…”