Leioproctus sicatus, or Leioproctus (Exleycolletes) sicatus, 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 sicatus (Latin: "dagger") is an anatomical reference to the long apical tooth of the mandible.
Description The holotype male body length is 9.7 mm, head width 3.0 mm; a female paratype body length 11.5 mm, head width 3.5 mm. Integumental colouration is mainly black, with brown markings. The hair is white to brown.
Distribution and habitat The species occurs in central Australia. The type locality is the Ledknapper Nature Reserve, near Enngonia in north-western New South Wales.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Seringia nephrosperma and Calytrix longiflora.
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