Hylaeus chlorosomus, or Hylaeus (Prosopisteron) chlorosomus, also known as the yellow-bodied masked bee, 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 to black, with yellow markings.
Distribution and habitat The species occurs in both south-western and south-eastern Australia. The type locality is Croydon, Victoria.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Calothamnus species.
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