Hylaeus microphenax, or Hylaeus (Prosopisteron) microphenax, 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 1910.
Description Male body length is about 5 mm. Integumental colouration is mainly black, with yellow markings.
Distribution and habitat The species occurs in eastern mainland Australia. The type locality is Mackay, Queensland. It has also been recorded from Manning Valley in north-eastern New South Wales.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Cassia species.
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