Leioproctus xanthosus, or Leioproctus (Ceratocolletes) xanthosus, 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 1993.
Etymology The specific epithet xanthosus (Greek: "yellow") is an anatomical reference to the facial hair of the males.
Description Female body length is about 12.5 mm, male body length 10 mm. Integumental colouration is mainly black; the hair is white, golden and brown.
Distribution and habitat The species occurs in eastern Australia. The type locality is 2 km west of Mount Cotton, Queensland.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Pultenaea euchila and Pultenaea spinosa.
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