Leioproctus criniventris, or Leioproctus (Euryglossidia) criniventris, 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 criniventris (Latin: "hairy venter") is an anatomical reference to the ventral metasoma.
Description The male body length is 10.5 mm, female body length 10.4 mm. Integumental colouration is mainly black and weakly iridescent, with brown and orange markings. The hair is white.
Distribution and habitat The species occurs in inland south-west Western Australia. The type locality is 5 km south-east of Thundelarra in the Murchison region.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Hakea preissii, Leptospermopsis erubescens and Grevillea paniculata, as well as Acacia species.
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