Bombus (Thoracobombus) pensylvanicus (DeGeer 1773)

Gibbs, Jason, Ascher, John S., Rightmyer, Molly G. & Isaacs, Rufus, 2017, The bees of Michigan (Hymenoptera: Apoidea: Anthophila), with notes on distribution, taxonomy, pollination, and natural history, Zootaxa 4352 (1), pp. 1-160 : 44-45

Bombus (Thoracobombus) pensylvanicus (DeGeer 1773) ( pensylvanicus group)

County records: Alger, Allegan, Alpena, Arenac, Barry, Bay, Benzie, Berrien, Branch, Calhoun, Cass, Cheboygan, Chippewa, Clare, Clinton, Eaton, Gladwin, Gogebic, Hillsdale, Huron, Ingham, Ionia, Iosco, Isabella, Jackson, Kalamazoo, Kent, Lapeer, Lenawee, Livingston, Macomb, Manistee, Mason, Mecosta, Midland, Monroe, Muskegon, Newaygo, Oakland, Oceana, Otsego, Saginaw, Sanilac, Shiawassee, St. Clair, St. Joseph, Tuscola, Van Buren, Washtenaw, Wayne.

Notes. No recent specimens examined. Bombus pensylvanicus is evidently a declining species in the northern extent of its historical range ( Grixti et al. 2009), but is still commonly seen in the south and western part of its range ( Cameron et al. 2011; many recent records at http://bugguide.net/node/view/65631).