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This bee's nest architecture is described by Sakagami and Michener (1962): Nest architecture is Type Va: Cells are oriented laterally to the main burrow, and clustered. This cluster is connected to the main burrow by a lateral burrow. The cluster is incompletely surrounded by a cavity created by burrowing around the cluster. Nests are known from both flat ground and banks. Nests, but not cells, are re-used by subsequent generations. Nest aggregation information: 1,000 in 10 square meters. This bee's social biology is described by Wcislo (1997): Is solitary at high altitudes in Japan, but eusocial at lower altitudes in Japan and elsewhere in Europe.