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B. lucorum group, not terrestris.
Could you please tell me the key features that would separate these two.
B. terrestris queens and males usually have a clearly brown tail and a very variable narrow dark brownish-yellow collar. B. lucorum group (consisting of an unknown number of species with unknown field features) never has a brown tail and has a broad paler yellow collar. Workers of both are often difficult to separate, but terrestris frequently has a brown line (much more obvious that the one mentioned by TaraH) at the base of the tail, often has an obviously brown tail, and often has a +- all white tail. The continental terrestris, which are in the wild in England after escapes from colonies bought in for pollination have a white tail. I see nothing in this bee that would suggest terrestris rather than lucorum group.
Thanks - very much a beeginner - really a botanist
Is it not B. terrestris? I thought the darker yellow rather than bright lemon yellow was indicative of B. terrestris rather than B. lucorum and it does seem as if there may be a very faint line of buff coloured hairs at the top of the white tail again indicative of B. lucorum.
It is not always possible to distinguish these species even in the hand. The tail is too white for typical terrestris, and the yellow too pale. It can never be identified with 100% confidence from this image, but if I had to choose it would be lucorum group.
I think Mydaea is probably right and that this is one of the B. lucorum group. It seems to have a bit of a dark "nick" in the yellow collar (on the shoulders) which might suggest B. cryptarum. However, as is pointed ouit above, these characters are subtle (at best) and unreliable
Lat/Lng: 51.1648, -3.2669
OS grid ref: ST115413