Leioproctus submetallicus, or Leioproctus (Colletellus) submetallicus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by entomologist Remko Leijs in 2018.
Etymology The specific epithet submetallicus refers to the faint metallic shine on the head and thorax.
Description The female holotype body length is 6 mm, head width 1.9 mm; male allotype body length is 5.9 mm, head width 1.85 mm. Integumental colouration is mainly black and brown. The hair is white to light brown and orange-brown.
Distribution and habitat The species occurs in Western Australia. The type locality is Mount Gibson Station in the Avon Wheatbelt bioregion.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Grevillea species.
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