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Possible Ptilothrix bombiformes?

Possible Ptilothrix bombiformes?
Bowman's Hill Wildflower Preserve, New Hope/Solebury Township, Bucks County, Pennsylvania, USA
July 27, 2011
I think the larger bee may be Ptilothrix bombiformes, and the smaller a Eucera species. Can you confirm or correct? They were on Swamp Rose Mallow (Hibiscus moscheutos) Thank you!

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Possible Ptilothrix bombiformes? Possible Ptilothrix bombiformes?

Moved from ID Request.

Melissodes bimaculatus male
And Bombus bimaculatus

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