Leioproctus plautus, or Leioproctus (Protomorpha) plautus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by Australian entomologist Glynn Maynard in 1991.
Etymology The specific epithet plautus (Latin: "flat-footed") is an anatomical reference to the hind basitarsus.
Description Male body length is about 7 mm. Integumental colouration is mainly black; the hair is white and brown.
Distribution and habitat The species occurs in south-west Western Australia. The type locality is 10–13 km north-east of Wanneroo.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Beaufortia elegans and Lechenaultia stenosepala.
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