Higher bee species density in the San Bernardino Valley than that reported from other long-term studies. Species density of bees for large-scale studies in North America determined by species-richness relationships following Meiners et al (2019) with updated information from this study. a) the trend-line indicates expected change in species richness with area sampled based on 22 studies (listed in Table 4 of Meiners et al [2019]) plus the San Bernardino Valley (black dot circled in red). b) is the difference in bee species observed relative to the prediction from the trend line in a). Updated information from the San Bernardino Valley alters the rank of species density from that shown in fig. 5 of Meiners et al (2019).