Leioproctus mastersi, or Leioproctus (Euryglossidia) mastersi, 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 9 mm. Colouration is mainly black; the abdomen chestnut-red with a purple lustre; the hair pale to grey-brown.
Distribution and habitat The species occurs in south-west Western Australia. The type locality is King George Sound.
Behaviour The adults are flying mellivores.
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