Leioproctus auricorneus, or Leioproctus (Colletellus) auricorneus, 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 auricorneus is a reference to the orange antennae.
Description The male holotype body length is 4.9 mm, head width 1.7 mm. Integumental colouration is mainly black with brown markings, antennae orange. The hair is white.
Distribution and habitat The species occurs in central Australia. The type locality is 56 km south-east of Alice Springs in the south of the Northern Territory.
Behaviour The adults are flying mellivores.
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