Hylaeus quadriceps, or Hylaeus (Planihylaeus) quadriceps, 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 1879.
Distribution and habitat The species occurs in southern Australia. Type localities include Hobart in Tasmania, Ferntree Gully in Victoria, and Denmark, Western Australia.
Behaviour The adults are solitary flying mellivores with sedentary larvae. They nest in Juncus effusus reeds. Flowering plants visited by the bees include Arctotheca, Hypochaeris, Lobelia and Wahlenbergia species.
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