psithyrus
noun
psith·y·rus
ˈsithərəs
1
capitalized : a genus of large bees resembling bumblebees but lacking the pollen-collecting apparatus and the worker caste and being parasitic in the nests of bumblebees
2
plural psithyri
-ˌrī
: any bee of the genus Psithyrus 
Word History
Etymology
New Latin, from Greek psithykos whispering, twittering