Leioproctus pappus, or Leioproctus (Leioproctus) pappus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by Australian entomologist Terry Houston in 1989.
Etymology The specific epithet pappus (Latin: "plant down") is an anatomical reference.
Description The male holotype body length is 7.8 mm, female paratype 9 mm. Integumental colouration is mainly glossy black; the hair is white.
Distribution and habitat The species occurs in south-west Western Australia from near Perth to Geraldton, as well as between Coolgardie and Southern Cross. The type locality is Boorabbin Rock.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Conospermum stoechadis.
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