Leioproctus semilucens, or Leioproctus (Leioproctus) semilucens, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by British-American entomologist Theodore Dru Alison Cockerell in 1929.
Description Female body length is about 8.5 mm. Integumental colouration is mainly black; the hair is white through grey and reddish-brown to black.
Distribution and habitat The species occurs in south-west Western Australia. The type locality is Perth.
Behaviour The adults are flying mellivores.
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