Leioproctus tomentosus, or Leioproctus (Leioproctus) tomentosus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by Australian entomologist Terry Houston in 1989.
Etymology The specific epithet tomentosus (Latin: "densely covered with matted wool or hair") is an anatomical reference.
Description The male holotype body length is 5.2 mm, female paratype about 6 mm. Integumental colouration is mainly black; the hair is white.
Distribution and habitat The species occurs in south-west Western Australia on the coastal plain some 140–180 km north of Perth. The type locality is Cataby. It has also been recorded from Badgingarra National Park.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Conospermum crassinervium.
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