Estimates from all sampling regimes predict approximately 500 bee species in the San Bernardino Valley. Comparison of sample-sized-based rarefaction (solid lines) and extrapolation (dashed line) from samples made in the core area, core area combined with the 2001 pan trap sampling at permanent sites, and all samples made in the San Bernardino Valley. Numbers in parentheses are the number of individuals in each dataset and the number of species. Calculations here are for Hill numbers of order q=0; order q = 2 is in Suppl. material 1: Figure S4. Estimated bee species richness at the base sample size of 94,240 individuals (i.e., double the smaller reference size of the smallest dataset) is 499.3 species, 508.4 and 516.1 species for the Core, Core + 2001 pan trap and All datasets respectively.