Leioproctus douglasiellus, or Leioproctus (Andrenopsis) douglasiellus, 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 douglasiellus honours Athol Douglas for his efforts in collecting the bees of Western Australia.
Description Female body length 8 mm, wing length almost 5 mm. Integumental colouration mainly black, hair white to brownish.
Distribution and habitat The species occurs in south-west Western Australia. The type locality is Pearce.
Behaviour The adults are flying mellivores.
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