Hylaeus serotinellus, or Hylaeus (Prosopisteron) serotinellus, 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 1906.
Description Female body length is 6.5 mm. Integumental colouration is mainly black, with yellow and brown markings.
Distribution and habitat The species occurs in north-eastern Australia. Type localities include Mackay and Kuranda.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Cassia, Eucalyptus, Eugenia, Jacksonia and Leptospermum species.
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