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Here are some ways to separate them:

Not so sure...

Bombus vosnesenskii or B. caliginosus?

How would I separate the two species?

Looks like a male Bombus caliginosus?

Probably Bombus vosnesenskii

Either Bombus vosnesenskii or

Probably Bombus vosnesenskii

Thanks Ken

B. californicus can "play dead"

Looks like Bombus vosnesenski


B. vosnesenskii in Montana

Bombus vosnesenskii vs. caliginosus

In that Bombus example...

Underside Hairs


maybe not...



Yellow faced bumblebee - Bomb

Probably a...

Hair at the top of the head (

Big and black but quite frien

mixtus should be all over the

Yellow-faced Bumble Bee

Yes! Pollen colors other than


Probably ...

Any difference in habits?

OK, I've moved all the images


Bombus vosnesenskii

Bombus caliginosus & B. vosnesenskii

bee is Bombus

I have down as Yellow-faced B

Almost certainly a male Bombu

Tricky to say - could be one

If it's any consolation, it's

Well, I'm only recording at m

Excellent! One of the specie


Bombus vosnesenskii


Agree with Bombus

cool bee!


Bombus vosnesenskii?

appears to be Bombus vosnesenskii

Mystery So Cal Bumblebee - Bombus vosnesenskii

Looks like

Check Bombus vosnesenskii

I have

Bombus vosnesenskii

Many thanks, Eric. I assume t

This time of year, not very much.

Bombus (Pyrobombus)

How about a no-taxon page entitled

Bombus caliginosus or vosnesenskii


Bombus (Pyrobombus) male

Bombus vosnesenskii or caliginosus

lowest level of certainty is caliginosus or vosnesenskii

Bombus vosnesenskii

Bombus vosnesenskii

Bombus vosnesenskii

Bombus vosnesenskii or caliginosus

Bombus (Pyrobombus)

not an ID but

not an ID but

Bombus vosnesenskii vs. caliginosus

I think you'll need a mug shot


Bombus californicus

Bombus vosnesenskii

Bombus vosnesenskii

Bombus (Pyrobombus)

Maybe Bombus californicus...

Bombus vandykei can be tough to ID

This is indicative of the act

Bombus vosnesenskii?

Bombus californicus

Bombus (Pyrobombus) vosnesenskii Radoszkowski, 1862

Bumble bee and ???


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