genus Psithyrus


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Noun1.genus Psithyrus - a large bee that resembles the bumblebee but lacks pollen-collecting apparatus and a worker caste
arthropod genus - a genus of arthropods
Apidae, family Apidae - honeybees; carpenter bees; bumblebees
cuckoo-bumblebee - a bee that is parasitic in the nests of bumblebees