Leioproctus mas, or Leioproctus (Baeocolletes) mas, 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 mas alludes to the holotype being the first male of the subgenus to be collected.
Description Male body length nearly 7 mm, forewing length nearly 4.5 mm. Integumental colouration mainly black and brown, hair white.
Distribution and habitat The species occurs in South West Queensland. The type locality is 8 km north of Nockatunga Station.
Behaviour The adults are flying mellivores.
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