FIGURE 2 in A checklist of the bees (Hymenoptera: Apoidea) of Minnesota

FIGURE 2. Collection effort in Minnesota counties. A) The number of specimens recorded by county before 2011. B) The total number of specimens all time (1890–2022). Differences in maps help illustrate the increase in sampling effort since 2011 and how recent collection efforts have largely been focused in the western areas of the state and the Twin Cities metropolitan area.