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Bumble Bees (Bombus)
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Subgenus Pyrobombus (Bombus Subgenus Pyrobombus)
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caliginosus or vosnesenskii (Bombus caliginosus or vosnesenskii)
Photo#274819
Copyright © 2009
Alice Cavette
Then Foursome - Yellow-faced Bumble Bees -
Bombus
-
Fremont, Alameda County, California, USA
May 12, 2009
Probably Bombus vosnesenskii but possibly B. caliginosus.
Fourth joined in 5 minutes later to the
Threesome
.
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Contributed by
Alice Cavette
on 12 May, 2009 - 5:00pm
Last updated 29 October, 2009 - 6:45pm
Moved
Moved from
Subgenus Pyrobombus
.
…
Alice Cavette
, 29 October, 2009 - 6:45pm
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Move to Pyrobombus?
Move to subgenus Pyrobombus for behavior?
…
Alice Cavette
, 12 May, 2009 - 6:54pm
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Yes, these are probably B. vosnesenskii
But they could be the extremely similar but less likely B. caliginosus
…
John S. Ascher
, 12 May, 2009 - 6:19pm
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Underside Hairs
GUIDE TO THE BOMBUS OF SAN FRANCISCO By Quinn S. McFrederick
"B. caliginosus is shaggier than B. vosnesenskii and has yellow hairs on the underside of the abdomen where B. vosnesenskii has only black hairs on the underside of the abdomen."
SF Bumble Bee expert says she "often can't tell unless I get them under a scope and can find some yellow abdominal hairs (which indicates caliginosus)".
…
Alice Cavette
, 12 May, 2009 - 6:31pm
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