Leioproctus gibber, or Leioproctus (Protomorpha) gibber, 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 2013.
Etymology The specific epithet gibber (Latin: "hump") refers to the distinctive protuberance on the vertex of the female.
Description Male body length is about 5.7 mm, head width 1.9 mm; female body length 7.2 mm, head width 2.3 mm. Integumental colouration is mainly black and brown; the hair is white to pale orange.
Distribution and habitat The species occurs in inland eastern Australia. The type locality is Ethabuka Reserve in Central West Queensland.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Scaevola parvibarbata and Scaevola depauperata.
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