Leioproctus nigrescens, or Leioproctus (Euryglossidia) nigrescens, 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 Male body length is nearly 6 mm and slender; female slightly longer and more robust. Colouration is mainly black; the abdomen dark brown with a faintly greenish lustre; the hair white to grey-brown.
Distribution and habitat The species occurs in south-west Western Australia. The type locality is Geraldton.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Hakea species.
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