Is there a definitive checklist for North American Bumblebees?

[Bees-in-Art]

Is there a definitive checklist for North American Bumblebees? Reason I'm asking is that I'm currently working on an engraving of the British bumblebees and that list is fairly contentious its self - with there being anything from 22 to 28 species on the list, depending on who you're talking to. So has anyone agreed on which bumblebees appear on the North American checklist (this will be my next engraving project). I guess that there will be a US checklist and a North American checklist?

Best wishes,

Andrew

[Michael Bush]

http://bumbleboosters.unl.edu/bbidentifier.shtml