Leioproctus argentifrons, or Leioproctus (Exleycolletes) argentifrons, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by English entomologist Frederick Smith in 1879.
Distribution and habitat The species occurs in south-west Western Australia and Victoria. The type locality is Swan River.
Behaviour The adults are flying mellivores.
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