Leioproctus pygmaeus, or Leioproctus (Minycolletes) pygmaeus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by Australian entomologist Glynn Maynard in 2013.
Etymology The specific epithet pygmaeus is Latin for "little" or "dwarf", with reference to the size of the bees.
Description Male body length is about 7 mm. Integumental colouration is black to dark brown, the legs paler. The hair is white.
Distribution and habitat The species occurs in Western Australia. The type locality is 7 km south-east of Newman in the Pilbara region.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Acacia species.
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