Percentage of specimen records per species detected in the western United States, including Alaska (Suppl. material 1). Western sites are defined as survey sites that are west of the Colorado Rockies (104th western longitude).

 
  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