Leioproctus cinereus, or Leioproctus (Leioproctus) cinereus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by English entomologist Frederick Smith in 1853.
Distribution and habitat The species occurs in South Australia. The exact type locality is unknown.
Behaviour The adults are flying mellivores.
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