Survey site abundance per World Wildlife Fund ecoregion (Olson and Dinerstein 2002, Olson et al. 2001). Black hexagons = eastern survey, black circles = western survey, black squares = Alaska survey.

  
  Part of: Koch J, Lozier J, Strange J, Ikerd H, Griswold T, Cordes N, Solter L, Stewart I, Cameron S (2015) USBombus, a database of contemporary survey data for North American Bumble Bees (Hymenoptera, Apidae, Bombus) distributed in the United States. Biodiversity Data Journal 3: e6833. https://doi.org/10.3897/BDJ.3.e6833