Hylaeus semirufus, or Hylaeus (Hylaeteron) semirufus, is a species of bee in the family Colletidae and subfamily Hylaeinae. It is endemic to Australia. It was described by British-American entomologist Theodore Dru Alison Cockerell in 1914.
Description Female body length is about 5 mm. Integumental colouration is mainly black, with red and yellow markings, the female abdomen red.
Distribution and habitat The species occurs in inland Australia. The type locality is Brewarrina in north-western New South Wales.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Cassia, Grevillea and Hakea species.
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