Leioproctus gelasinatus, or Leioproctus (Leioproctus) gelasinatus, 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 gelasinatus (Latin: "with a dimple") is an anatomical reference to a depression in the propodeal triangle.
Description The holotype male body length is 7.8 mm, head width 2.4 mm; female body length 8.8 mm, head width 2.7 mm. Integumental colouration is mainly black with brown markings. The hair is white to brown.
Distribution and habitat The species occurs in eastern inland Australia. The type locality is 24 km west of St George in southern Queensland.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Acacia burbidgeae, Calytrix longiflora, Dianella longifolia, Eremophila sturtii, Eremophila gilesii, Micromyrtus hexamera and Newcastelia interrupta.
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