Leioproctus nicholsoni, or Leioproctus (Leioproctus) nicholsoni, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by British-American entomologist Theodore Dru Alison Cockerell in 1929.
Description Female body length is nearly 7 mm. Colouration is mainly black, the hair is white to grey.
Distribution and habitat The species occurs in Western Australia. The type locality is Kojarena.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Caladenia species.
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