I've keyed out what I thought was a male cuckoo bumblebee and come up with B. rupestris but its got red hairs on all legs - which I thought only B. ruderarius had. A quick search of the web couldn't find any rupestris with red legs either.
Does rupestris in fact have red legs - is it only the males which do? Or have I keyed it out really badly and in fact got ruderarius after all?!