Leioproctus concavus, or Leioproctus (Leioproctus) concavus, 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 1990.
Etymology The specific epithet concavus (Latin: “concave”) is an anatomical reference to the form of the clypeus.
Description The female holotype body length is about 6 mm. Integumental colouration is mainly black to dark brown, with some orange-brown on the metasoma; the hair is white to brown.
Distribution and habitat The species occurs in south-west Western Australia near Norseman and Kalgoorlie. The type locality is 70–75 km east-north-east of Norseman.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Eremophila scoparia.
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