Palaeorhiza viridifrons, or Palaeorhiza (Cnemidorhiza) viridifrons, is a species of bee in the family Colletidae and subfamily Hylaeinae. It is endemic to Australia. It was described by British entomologist Theodore Dru Alison Cockerell in 1921.
Description The female holotype has a body length of 9 mm. Integumental colouration is mainly black with a bluish, green and purple metallic sheen, and with bright orange markings.
Distribution and habitat The species occurs in eastern Australia. The type locality is Brisbane. It has also been recorded from Dayboro, Queensland.
Behaviour The adults are flying mellivores.
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