A guide to North American bumble bees. It focuses on the molecular research that shows the enormous color variation within species, and guides readers through the many confusing convergences between species.
Paul H. Williams is a research entomologist at the Natural History Museum in London. Robbin W. Thorp is professor emeritus of entomology at the University of California, Davis. Leif L. Richardson is a doctoral candidate in the Department of Ecology and Evolutionary Biology at Dartmouth College. Sheila R. Colla is an NSERC postdoctoral fellow and project leader at Wildlife Preservation Canada.