Leioproctus pusillus, or Leioproctus (Exleycolletes) pusillus, 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 Colouration is mainly black; the hair white.
Distribution and habitat The species occurs in Western Australia. The type locality is Geraldton.
Behaviour The adults are solitary flying mellivores that nest gregariously in the ground. Flowering plants visited by the bees include Baeckea pentagonantha and Hakea erinacea.
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