Leioproctus plumosus, or Leioproctus (Leioproctus) plumosus, 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 across southern Australia. Type localities include Swan River in Western Australia and Mount Yule near Healesville in Victoria.

Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Acacia, Daviesia, Eucalyptus, Leucopogon and Salpichroa species.

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