Hylaeus trimerops, or Hylaeus (Prosopisteron) trimerops, 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 1916.
Description Female body length is about 4 mm. Integumental colouration is mainly black, with yellow to reddish markings.
Distribution and habitat The species occurs in south-west Western Australia. The type locality is Yallingup.
Behaviour The adults are flying mellivores.
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