Hylaeus quadratus, or Hylaeus (Prosopisteron) quadratus, is a species of bee in the family Colletidae and subfamily Hylaeinae. It is endemic to Australia. It was described by English entomologist Frederick Smith in 1853.
Distribution and habitat The species occurs in eastern Australia. The type locality is simply "New Holland". It has been recorded from Oxley, Wallangarra and Lamington National Park in south-eastern Queensland.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Leptospermum and Lomatia species.
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