orange.black.white tail tip
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You have the Latin name correct but it's known as the Tree Bumble Bee. The White-tailed Bumble Bee is a totally different species.
It might be worth submitting a revised ID to avoid confusion.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 53.8, -1.7
OS grid ref: SE2034