Distinguishing Bombus impatiens, bimaculatus, & griseocollis

This is the second part of the ID-a-thon bee presentation. Re-done in google slides, looks a lot better, will update the others in the series in this format.


Posted by neylon neylon, May 20, 2021 01:51 AM


Thank you! This level of detail is so helpful.

Posted by sarahwilson1 over 1 year ago (Flag)

Thanks for checking it out.
I just noticed that google drive screwed up the layout I had, I'll try to fix that today.

Posted by neylon over 1 year ago (Flag)

This is fantastic! And very helpful. I need to look for the first post now. Thank you so much for sharing this information. Cheers chd

Posted by chdonati over 1 year ago (Flag)

Even though as a west coaster I'm likely to be dealing with different species, I am still finding these documents very valuable in demonstrating the types of fieldmarks to look for and examples of how to identify them on images. I find the comparative images extremely useful in this regard. Thanks so much for taking the time to create such an informative series of documents!

Posted by wildnettle over 1 year ago (Flag)

I just re-did the the entry in google slides, it looks a lot better then it did.

Posted by neylon about 1 year ago (Flag)


Posted by chdonati about 1 year ago (Flag)

Looks fantastic!

Posted by wildnettle about 1 year ago (Flag)

Thank you , It's now linked to my reference list and will be guiding me in the coming season.

Posted by louc33 11 months ago (Flag)

Wickedly, totally awesome guide. But do you know how many photos I have to go back through now?

Posted by contrarianvulgarian 10 months ago (Flag)

Joel, thank you for the great guides you have put together on Bombus spp. They are very informative and helpful to those of use learning how to identify bees in the field.

Posted by psking 9 months ago (Flag)

Excellent guide! Thanks so much for sharing this.

Posted by scoutingforplants 9 months ago (Flag)

Excellent! Now I know what details to try to capture when photographing Bombus to get a positive ID.

Posted by mnerrie 8 months ago (Flag)

Excellent tutorial! Thanks for taking the time to help others learn the differences among these bumblebees!

Posted by zitserm 8 months ago (Flag)

I'm so glad this resource exists! All my field guide uses to distinguish B. impatiens and B. bimaculatus are the spots on T2. But then you IDed some of my bee observations as bimaculatus without me even having a decent view of the abdomen!
I have a question though. On the slide titled "Scutum (cont.) B griseocollis", the pictures all have large black spots on their scutum, but you state before that that they only have a small black spot. Are those pictures of impatiens or bimaculatus instead?

Posted by spellecchias 7 months ago (Flag)

@spellecchias The left and middle pictures on that page are griseocollis males which can look a little different from the females. I should probably note that on the page. Thanks

Posted by neylon 7 months ago (Flag)

Good to know, thanks!

Posted by spellecchias 7 months ago (Flag)

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