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Species Bombus auricomus - Black-and-gold Bumble Bee

Bumblee Bee - Bombus auricomus - male Bombus terricola? - Bombus auricomus - female Is this my bimaculatus queen? - Bombus auricomus - female Mating Bombus' - Bombus auricomus - male - female Bumble bee for ID - Bombus auricomus Black and Gold Bumble Bee - Bombus auricomus - female Bombus  - Bombus auricomus Bumble Bee - Bombus auricomus - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Bees, Ants, 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)
Species auricomus (Black-and-gold Bumble Bee)
Other Common Names
Often cited as Black and Gold Bumble Bee, but use of a hyphen is generally preferred when citing common names (see AOU and BOU bird checklists, e.g., Black-and-white Warbler).
Synonyms and other taxonomic changes
Bombus nevadensis is treated as conspecific with B. auricomus by some sources, and as a separate species by other sources; most recent sources treat them separately - see link to taxonomic discussion in Internet References section below
Explanation of Names
auricomus means "with golden hair"
Size
queen: body length 20-25 mm
male: 17-20 mm
worker: 18-20 mm
Identification
Muellerian mimic of the American Bumble Bee

Note the following:

- ocelli low on face
- yellow hairs on vertex
- yellow hairs on scutellum (thin yellow posterior thoracic band)
- with more yellow on scutellum and more black on T1 than pensylvanicus

See detailed descriptions at discoverlife.org
Internet References
taxonomic status discussion of auricomus and nevadensis (Paul Williams, Natural History Museum, UK)
color diagrams of nevadensis and auricomus (Natural History Museum, UK)
common name reference; PDF doc (Committee on Common Names of Insects, Entomological Society of America)