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Subgenus Bombias

Bombus nevadensis? - Bombus nevadensis - female Bombus nevadensis? - Bombus nevadensis Bombus nevadensis? - Bombus auricomus  what kind of very large and loud Bombus?  28 mm - Bombus nevadensis - female Bombus sp - Bombus auricomus Bombus sp - Bombus auricomus Huge Bumblebee - Bombus nevadensis Bumble bee - Bombus auricomus
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 Bombias
Numbers
2 spp. in our area + 1 sp. in the Palaearctic (3 spp. total)(1)
Identification
Males have conspicuously large eyes and modified antennae. Females with ocelli low on face. Midleg with sharp angle.
Range
holarctic group; B. auricomus occurs mostly east of the Rockies, while B. nevadensis occurs in Western North America. Records of B. nevadensis from eastern North America pertain to auricomus, which has often been considered a mere subspecies (map)(1)
Habitat
Open grasslands and mountain meadows(2)
Season
Late-emerging
Remarks
Both species prefers open habitats so have no doubt declined due to loss of grasslands and, in areas such as the Northeastern United States, due to regrowth of forests.

Their mating and nesting behavior is unusual reflecting their phylogenetic position outside (sister to) all other North American species.