Hylaeus mediovirens, or Hylaeus (Prosopisteron) mediovirens, 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 1913.
Description Female body length is about 4.5 mm. Integumental colouration is mainly dark green, with cream to pinkish-white markings.
Distribution and habitat The species occurs in south-eastern Australia. The type locality is Purnong, South Australia. It has also been recorded from Launceston, Tasmania.
Behaviour The adults are flying mellivores.
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