Leioproctus sericeus, or Leioproctus (Euryglossidia) sericeus, 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 sericeus (Greek: "silky" or "satiny") is an anatomical reference to the metasomal terga.
Description The female body length is 5.5 mm. Integumental colouration is mainly black, the metasoma satiny, with bronze apical tergal margins. The hair is white to pale brown.
Distribution and habitat The species occurs in Western Australia. The type locality is Meleya Well on Thundelarra Station in the Murchison region.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Eremophila longifolia, as well as Thryptomene, Keraudrenia and Eucalyptus species.
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