Two new species of Macrochiron (Lichomolgidae) from Madagascar, associated with hydroids, are described: M. lobatum from Lylocarpus phoeniceus and M. vervoorti from Aglaophenia cupressina. New host records are: M. valgum Humes, 1966, from Gymnangium hians and G. gracilicaulis, and M. rostratum Humes, 1966, from Gymnangium hians, G. gracilicaulis, and Aglaophenia delicatula. Keys for both sexes of the species in the genus are included.