Leioproctus pustulatus, or Leioproctus (Euryglossidia) pustulatus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by entomologist Michael Batley in 2025.
Etymology The specific epithet pustulatus (Latin: "with a pimple") is an anatomical reference to the ventral margin of the clypeus.
Description The holotype female body length is 7.5 mm. Integumental colouration is mainly black, the metasoma chestnut. The hair is white to brown.
Distribution and habitat The species occurs in Western Australia. The type locality is 5 km south-east of Thundelarra in the Murchison region.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Grevillea yorkrakinensis.
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