Hippolais is a genus of tree warbler in the Acrocephalidae family. It is sometimes lumped together with the genus Iduna. It contains the following species: \n* Upcher's warbler (Hippolais languida) \n* Olive-tree warbler (Hippolais olivetorum) \n* Melodious warbler (Hippolais polyglotta) \n* Icterine warbler (Hippolais icterina) The genus name Hippolais is from Ancient Greek hupolais, as misspelt by Linnaeus. It referred to a small bird mentioned by Aristotle and others and may be onomatopoeic or derived from hupo,"under", and laas, "stone".