Thought you might like to see this handsome chap! I had a very hairy one last year, but this is ridiculous!
I am intrigued by the differences in B. lucorum males, I don't see such big differences in the females. As some will know, there are others grouped into the one species but they are difficult to separate. I found an interesting article about the labial gland secretions being different in different colour forms. Chemotaxonomy of Bombus lucorum occuring in the Czech Republic
I would like to know more about these but the waters look to be murky. Looking at the hind legs, this, and pics of other males I have seen look like they have pollen baskets but that can't be so!
One other thing which I have noticed is the face of the very hairy male I had last year, it had a creamy coloured sort of soft bone cartilage type area. Do all the males have this? Finding close up pics of male B. lucorum faces is not easy.
I would like to hear from anyone who knows more about these, or anyone who has had similar confusing thoughts please air them here.