Leioproctus moniliformis, or Leioproctus (Leioproctus) moniliformis, 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 1916.
Description Male body length is 9 mm. Colouration is mainly black, the abdomen purplish and greenish, with white to brown 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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