Numbers
the tribe contains a single genus
(1)Range
holarctic; in NA most diverse in southwestern deserts, with few records in the east
Habitat
In/near nest aggregations of Perdita in dry sandy sites near host plants
Season
Matching that of their Perdita hosts. Some fly in spring, others in late summer.
Remarks
Scarce in collections but can be numerous at extensive host's nesting sites
Print References
See papers by A. Roig-Alsina and S. Shanks