Apoidea, Sphecoidea, and Vespoidea
Perkins, R. C. L. (Robert Cyril Layton), 1866-1955 Cheesman, Evelyn, 1881-1969
Article
1928
Insects of Samoa and other Samoan terrestrial arthropoda
Part V
1--32
BioStor
London,
BioStor: https://biostor.org/reference/145370