Abstract: The parasitic genus, Melanocolax, which is represented only in South Africa, was established by Martin et Pocock (1953), who assigned in it a single species: M. velutina. M. velutina is a parasite of Rhodomelopsis africana Pocock; it gives rise to branched monosiphonous filaments within the infected tissues but produces velvet pustules to the external of the host. From the surfaces of these pustules, free fertile branchlets are produced. The present paper deals with the developmental history of female and asexual reproductive organs of M. velutina; material of which species, used in this study, was furnished by Prof. G. F. Papenfuss, to whom I am much indebted.