Leioproctus rostratus, or Leioproctus (Euryglossidia) rostratus, 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 rostratus (Latin: "beaked") is an anatomical reference to the clypeus.
Description The female body length is 7.5 mm. Integumental colouration is mainly black, the metasoma orange-brown. The hair is white to brown. It has a has a large, snout-like clypeus.
Distribution and habitat The species occurs in south-west Western Australia. The type locality is 62 km east of Hyden in the eastern Wheatbelt.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Hakea bucculenta and Hakea francisiana.
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