Leioproctus laciniosus, or Leioproctus (Colletellus) laciniosus, 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 laciniosus is an anatomical reference to the fringe of white hairs on the posterior T2–4.
Description The female holotype body length is 5.6 mm, head width 1.9 mm; male allotype body length is 4.4 mm, head width 1.6 mm. Integumental colouration is mainly black and orange-brown. The hair is mostly white.
Distribution and habitat The species occurs in arid central and southern inland Australia. The type locality is Bon Bon Station.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Angianthus brachypappus.
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