Leioproctus sexmaculatus, or Leioproctus (Leioproctus) sexmaculatus, 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 1914.
Description Female body length is 13–14 mm, male 11–12 mm. Colouration is mainly black, the abdomen dark bluish-green, with white hair.
Distribution and habitat The species occurs in south-west Western Australia. The type locality is Yallingup.
Behaviour The adults are flying mellivores.
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