Within the genus Bombus, to which subgenus is the Vestal Cuckoo Bumblebee assigned?

Answer

Psithyrus

The subgenus Psithyrus is the specific taxonomic group within the genus Bombus that categorizes parasitic bees, distinguishing them from the social bumblebees that establish their own independent colonies every year.

Within the genus Bombus, to which subgenus is the Vestal Cuckoo Bumblebee assigned?
taxonomyanimalinsectbeeclassification