Leioproctus cupreus, or Leioproctus (Leioproctus) cupreus, 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 over much of mainland Australia. Type localities include Adelaide, as well as Perth and Cunderdin, Western Australia.

Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Physopsis viscida, Eucalyptus conglobata, Eucalyptus gracilis, Eucalyptus leptopoda, Eucalyptus oleosa, Malleostemon tuberculatus and Melaleuca lanceolata.

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