The bumblebees of Colorado (Hymenoptera: Apidae)

"The Bumblebees of Colorado" is a field guide that presents life history information about the Bombus species in Colorado. This guide includes morphological descriptions, county level distribution maps, elevation range figures, flight period descriptions, and host plant lists for all 23 species of Colorado bumblebees. It is intended for use by taxonomists, systematists, ecologists, and conservation managers.