Leioproctus sigillatus, or Leioproctus (Leioproctus) sigillatus, 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 10 mm. Colouration is mainly black with some red markings, with pale ochreous hair.
Distribution and habitat The species occurs in South Australia. The exact type locality is unknown.
Behaviour The adults are flying mellivores.
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