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Species Bombus morrisoni - Morrison's Bumble Bee

Bombus? - Bombus morrisoni - male Bombus? - Bombus morrisoni Morrison's Bumble Bee - Bombus morrisoni - male Bee_IMG_0264 - Bombus morrisoni Could this be Bombus morrisoni? - Bombus morrisoni unidentified Bombus - Bombus morrisoni Bombus morrisoni - male Bumblebee - Bombus morrisoni
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Ants, Bees and Stinging Wasps)
No Taxon (Anthophila (Apoidea) - Bees)
Family Apidae (Cuckoo, Carpenter, Digger, Bumble, and Honey Bees)
Subfamily Apinae (Honey, Bumble, Long-horned, Orchid, and Digger Bees)
Tribe Bombini (Bumble Bees)
Genus Bombus (Bumble Bees)
No Taxon (Subgenus Cullumanobombus)
Species morrisoni (Morrison's Bumble Bee)
Explanation of Names
Honors Herbert Knowled Morrison (1854-1885) who made pioneering entomological expeditions to the mountains of the Western United States in the 1870s and early 1880s. His bumble bees were studied and described by Ezra T. Cresson. He was among the first to collect bees in what are now the southwestern states.
Identification
Resembles B. nevadensis but in morrisoni the coat is a brighter more golden (less brown) hue, the vertex has more extensive yellow hairs, and the scutum is uniformly covered in yellow hairs without a conspicuous medial spot. The eyes of morrisoni are enlarged but less so than in nevadensis. Also resembles its relative B. griseocollis, but yellow tergal hairs extend to T3.
Range
Western North America, especially the Great Basin region and Southwestern mountains and canyons
Food
The Hosts section of its Discover Life species page lists known associations based on specimen records and images.
Remarks
Commonly found in the past at the Southwestern Research Station in SE Arizona, but not present in recent years
Internet References
Link to photos of male genitalia (Natural History Museum, UK)