The Cerulean paradise flycatcher (Eutrichomyias rowleyi), is a medium-sized (up to 18 cm long), monarch flycatcher with bright cerulean blue plumage, a bare white orbital ring, dark brown iris, bluish black bill and pale blue-grey below. The young has a shorter tail and grey underparts. It is the only member of the monotypic genus Eutrichomyias. The scientific name commemorates the British explorer and ornithologist George Dawson Rowley.