734 spp. in 6 genera of 3 tribes in our area, ~1,400 spp. in 35 genera of 6 tribes worldwide (almost half of the world's spp. are in Perdita
usually smaller, less hairy than Andreninae, and sometimes have yellow- or cream-coloured markings on all tagmata.
Apex of marginal cell truncate, and usuallly only two submarginal cells.
worldwide, but >2/3 spp. in NA and just ~160 in the Old World, where they are restricted to w. Palaearctic & Africa (+2 spp. in e. Asia); the 3 tribes absent in NA are tiny (4 spp. combined) are all restricted to Brazil or Chile(1)
most are univoltine and have a short flight season
most are specialists, collecting pollen from a single plant taxon