Leioproctus contrarius, or Leioproctus (Colletopsis) contrarius, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by American entomologist Charles Duncan Michener in 1965.
Etymology The specific epithet contrarius refers to the contrasting punctation of body parts, especially the head and the thorax.
Description Female body length 10 mm, forewing length 7 mm. Integumental colouration mainly black and brown, hair white to yellowish and brown.
Distribution and habitat The species occurs in south-west Western Australia. The type locality is Bullsbrook.
Behaviour The adults are flying mellivores.
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