Leioproctus impatellatus, or Leioproctus (Excolletes) impatellatus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by American entomologist Charles Duncan Michener in 1965.
Etymology The specific epithet impatellatus is an anatomical reference to the lack of basitibial plates or "patellae".
Description Female body length 8 mm, forewing length 4.5 mm; male body length 5.5 mm, forewing length 3.5 mm. Integumental colouration mainly black, hair white through brown to black.
Distribution and habitat The species occurs in inland central and eastern mainland Australia. The type locality is Tibooburra in the far north-west of New South Wales.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Corymbia terminalis as well as Grevillea species.
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