Leioproctus aratus, or Leioproctus (Colletellus) aratus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by entomologist Remko Leijs in 2018.
Etymology The specific epithet aratus is an anatomical reference to the coarse pit-reticulate sculpture on the head.
Description The male holotype body length is 6 mm, head width 1.85 mm. Integumental colouration is mainly black and brown. The hair is white to brown.
Distribution and habitat The species occurs in south-west Western Australia. The type locality is Orange Grove, Perth.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Prasophyllum fimbria.
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