Leioproctus rubicundus, or Leioproctus (Colletellus) rubicundus, 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 rubicundus refers to the colour of the female metasoma.
Description The female holotype body length is 6.1 mm, head width 2.1 mm; the male allotype body length is 5.5 mm, head width 1.7 mm. Integumental colouration is mainly black, orange and brown; the female metasoma is orange, that of the male black. The hair is white.
Distribution and habitat The species occurs in southern inland Australia. The type locality is Bon Bon Station in South Australia.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Angianthus brachypappus as well as Gunniopsis species.
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