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Bombus sitkensis Nylander, 1848
Bombus oregonensis Cresson, 1878; Bombus mixtuosus Ashmead, 1902

Life   Insecta   Hymenoptera   Apoidea   Apidae   Bombus
Subgenus: Pyrobombus

Bombus sitkensis, female, face
Smithsonian Institution, Entomology Department · 9
Bombus sitkensis, female, face

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Bombus sitkensis, female, side
Smithsonian Institution, Entomology Department · 9
Bombus sitkensis, female, side
Bombus sitkensis, female, top
Smithsonian Institution, Entomology Department · 9
Bombus sitkensis, female, top

Bombus sitkensis, female, wing
Smithsonian Institution, Entomology Department · 9
Bombus sitkensis, female, wing
Bombus sitkensis, Barcode of Life Data Systems
Barcode of Life Data Systems · 1
Bombus sitkensis, Barcode of Life Data Systems

UGCA196000 01.male_front.320.jpg
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male front
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male front top
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male top
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male side
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male rear
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male rear tip
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UGCA196001 01.queen_front.320.jpg
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queen front
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queen front top
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queen top
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queen side
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queen rear
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queen rear tip
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UGCA196002 01.worker_front.320.jpg
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worker front
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worker front top
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worker top
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worker side
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worker rear
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worker rear tip
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Identification
Extracted from Jonathan Koch, James Strange,Paul Williams.2012. Bumble Bees of the Western United States. A product of the U.S. Forest Service and the Pollinator Partnership with funding from the National Fish and Wildlife Foundation

Status: Common

Select food plant genera: Ebilobium, Lupinus, Rubus, Rosa, Vicia, Rhododendron

Tongue Length: Medium

Distribution: Almost exclusive to Pacific coastline in the U.S. except for populations found in the Sawtooth wilderness of northern Idaho

Can be confused with B. flavifrons, B. mixtus, and B. melanopygus

Females (queens and workers, colors refer to ‘hair’)

Thorax anterior to the wing bases black and yellow intermixed (clouded), scutellum black, sometimes with yellow/white intermixed laterally, T1-2 yellow, T3 black, T4-5 with pale hairs, face square.

Mid leg basitarsus with the distal posterior corner rounded. Cheek length longer than broad. Hair of the face and top of head with black and yellow intermixed, ocelli large and at supraorbital line. On the side of the thorax, the lower anterior surface with black and yellow intermixed (cloudy). Corbicular fringes long and with yellowish-red hairs. Hair length medium and uneven.


Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Aster @ AMNH_BEE (1)

Centaurea sp @ BBSL (3)

Centaurea @ LACM_ENTB (3)

Cirsium vulgare @ BMEC_ENT (1)

Senecio crassulus @ BBSL__MOSCOW (1)

Senecio sp @ BBSL (1)

Solidago @ AMNH_BEE (1)
Brassicaceae  Brassica @ EMEC (1)

Raphanus sativus @ EMEC (1)
Caprifoliaceae  Symphoricarpos albus @ BBSL (2)
Clusiaceae  Hypericum perforatum @ BBSL (1)
Ericaceae  Gaultheria shallon @ BBSL (1)

Rhododendron macrophyllum @ BBSL (5)

Rhododendron @ AMNH_BEE (2)

Vaccinium ovatum @ EMEC (1)

Vaccinium @ EMEC (10)
Fabaceae  Lathyrus sp @ BBSL (1)

Lupinus sp @ BBSL (14)

Trifolium sp @ BBSL (1)

Vicia gigantea @ BBSL (6)

Vicia @ EMEC (3)
Freilich, j.  1420 @ JRYA__OLYM (1)
Grossulariaceae  Ribes sanguineum @ AMNH_BEE (2)

Ribes @ AMNH_BEE (5)
Herndon, j.d.  1402 @ JRYA__OLYM (1)

1449 @ JRYA__OLYM (1)

1476 @ JRYA__OLYM (4)

1487 @ JRYA__OLYM (2)

1537 @ JRYA__OLYM (1)
Hydrophyllaceae  Phacelia leptosepala @ BBSL (1)
Lamiaceae  Agastache sp @ BBSL (1)

Stachys bullata @ UCRC_ENT (1)
Onagraceae  Epilobium angustifolium @ BBSL (71)

Gayophytum diffusum @ EMEC (1)
Primulaceae  Dodecatheon alpinum @ BBSL (1)
Rhamnaceae  Ceanothus @ AMNH_BEE (3)
Rosaceae  Rosa sp @ BBSL (7)

Rubus allegheniensis @ BBSL (3)

Rubus parviflorus @ BBSL (3)

Rubus sp @ BBSL (6)

Rubus @ EMEC (1)

Spiraea douglasii @ BBSL (1)
Rykken, j.  1348 @ JRYA__OLYM (1)

1373 @ JRYA__OLYM (1)

1379 @ JRYA__OLYM (1)

1450 @ JRYA__OLYM (1)

145 @ JRYA__NOCA (12)

1487 @ JRYA__OLYM (1)

1511 @ JRYA__NOCA (5)

153 @ JRYA__NOCA (3)

154 @ JRYA__NOCA (1)

1669 @ JRYA__OLYM (1)

1670 @ JRYA__OLYM (1)

1745 @ JRYA__NOCA (2)

198 @ JRYA__OLYM (1)

228 @ JRYA__OLYM (1)

507 @ JRYA__NOCA (3)
Salicaceae  Salix @ EMEC (1)
Scrophulariaceae  Pedicularis groenlandica @ BBSL (1)

Scrophularia californica @ LACM_ENTB (8); BBSL (3)

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Updated: 2018-09-23 20:25:54 gmt
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