Hylaeus trilobatus, or Hylaeus (Planihylaeus) trilobatus, 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 6 mm. Integumental colouration is mainly black, with yellow markings.
Distribution and habitat The species occurs in south-eastern mainland Australia. Type localities include Caloundra in south-eastern Queensland, as well as the Victorian Mallee, the Dandenong Ranges and Bayswater, Victoria.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Daviesia, Jacksonia, Melaleuca, Pultenaea and Rubus species.
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