Robert Brenchley wrote:
> We don't use the term for solitary bees, but for the social bees of the
> genus Bombus, and often colloquially for similar-looking bees such as the
> cuckoo
> bees of the genus Psithyrus.
I understand that psithyrus has now been reclassified as a sub-genus of the
genus Bombus.
Peter Edwards
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