References

The following literature was used in preparing the current version of the Bees of Colorado List.
- Hurd P.D. Jr. 1979. Superfamily Apoidea, in K.V. Krombein, P.D. Hurd, Jr., D.R. Smith, and B.D. Burks, eds., Catalog of Hymenoptera in America North of Mexico, vol. 2, pp. 1741-2009. Washington DC, Smithsonian Institution Press.
- Michener .C.D. 2000. The Bees of the World. 913 pp., Baltimore MD: Johns Hopkins University Press.
- Poole, R.W. and P. Gentili eds., 1996. Nomina Insecta Nearctica: A checklist of the Insects of North America, vol. 2. 793pp. Rockville MD. Entomological Information Services.

