Leioproctus chaetosus, or Leioproctus (Exleycolletes) chaetosus, 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 chaetosus (Latinised Greek: "long hair") is an anatomical reference to the tufts on S8 of the male.
Description The holotype male body length is 9.3 mm, head width 2.8 mm; female body length 10 mm, head width 3.2 mm;. Integumental colouration is mainly black, with brown markings. The hair is white to brown.
Distribution and habitat The species occurs in inland eastern Australia. The type locality is 22 km south of Charleville, Queensland. It has also been recorded from Hattah-Kulkyne National Park in north-western Victoria.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Calotis erinacea.
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