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Species Bombus bifarius - Black-notched Bumble Bee

Bumble Bee - Bombus bifarius - female Bombus 01a - Bombus bifarius - female Bumble Bee - Bombus bifarius - male What kind of Bumble bee is this? - Bombus bifarius - male Mating Bumblebees - Bombus bifarius - male - female
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 Pyrobombus)
Species bifarius (Black-notched Bumble Bee)
Explanation of Names
Author: Cresson, 1878.

Common name proposed here refers to the black notch bisecting the scutellum.
Size
Relatively small
Identification
In both sexes the most distinctive feature is the medial notch of black hairs bisecting the scutellum more conspicuous than in other species (approached but not matched in ternarius and sylvicola). Facial hairs of female extensively yellow (vs. largely black in B. sylvicola). Color of T2-T3 highly variable, i.e. black (nearcticus form), entirely red, or a mix of these colors. The black "nearcticus" form is common in cismontane California.
Range
Western North America
Food
A generalist favoring open flowers such as composites. The Hosts section on its Discover Life species page lists known associations based on specimen records and images.
Remarks
An abundant and widely distributed species.