Bumble bees are some of our most abundant and recognizable pollinators, essential for the pollination of many native flowering plant species. As such, the diversity of bumble bees has a long history of study by both professionals and amateurs. Because of such extensive study, it is felt that new species of bumble bees are unlikely to be found. Outstanding controversies remain, however, in what comprises a given bumble bee species.
American Bumble Bee Guide - New York Natural Heritage Program
Maryland Biodiversity Project - Two-spotted Bumble Bee (Bombus
Common Eastern Bumble Bee
ID a Bumble Bee : USDA ARS
Common Eastern Bumble Bee
Scientists fail to locate once-common CA bumble bees
One of the most common North American bumble bee species is
Maryland Biodiversity Project - Common Eastern Bumble Bee (Bombus
Scientists fail to locate once-common CA bumble bees
Western Bumble Bee and Native Pollinator Research