Ixodes (Lepidixodes) paradoxus n. sp. is described from females and immature specimens off bats in Malaya, North Borneo, and the Republic of the Congo. The females are exceptional in that porose areas, present in females of all other species of Ixodidae, are apparently lacking. It is suggested that I. paradoxus may eventually prove to be a synonym of I. (L.) kopsteini (Oudemans), 1925 known from a single male off bat, Amboina, but determination of this must await the definite association of the sexes of one or the other of the two species.