Hello-
I remember from reading a New Naturalist book on bumble bees some time ago that there are several predatory and parasitic pseudo bees that prey on bumble bees. Have a look on Wkipedia
http://en.wikipedia.org/wiki/Bumblebee#Associated_parasites
and see under 'cuckoo bumblebees'
Hi,
Thank you for your reply, I have checked on Wkipedia, and it sounds as though it could be the same. It was so strange as it didn't collect pollen itself. which Wkipedia states 'cuckoo bumblebees' don't. It did chase honey bees and landed on them, but didn't seem to have any effect on them at all.
Many thanks
Meerkat