Leioproctus alatus, or Leioproctus (Colletellus) alatus, 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 alatus is an anatomical reference to the wing-shaped lateral lobes of the male S7.
Description The male holotype body length is 5.1 mm, head width 1.5 mm. Integumental colouration is mainly black with orange to brown markings.
Distribution and habitat The species occurs in Western Australia. The type locality is Kalbarri National Park.
Behaviour The adults are flying mellivores.
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