Leioproctus bicristatus, or Leioproctus (Leioproctus) bicristatus, 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 about 8 mm. Integumental colouration is mainly black; abdomen faintly greenish; hair is silvery white to dark grey-brown and black.
Distribution and habitat The species occurs in eastern Australia. The type locality is Tooloom in north-eastern New South Wales.
Behaviour The adults are solitary flying mellivores that nest gregariously in sand. Flowering plants visited by the bees include Atalaya hemiglauca, as well as Leptospermum and Melaleuca species.
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