Joyeux & Baer, in 1935, recognized a new genus when they described Pseudoporrorchis houdemeri, a new species of Acanthocephala taken from the intestine of Centropus sinensis intermedius at Tonkin, Indo-China. They reviewed the literature and assigned four additional species to this genus as follows: Echinorhynchus rotundatus von Linstow, 1897; E. centropi Porta, 1910; E. bulbocaudatus Southwell & Macfie, 1925; and E. centropusi Tubangui, 1933. These same authors presented a tabular comparison of the five species, based upon all of the usual morphological details utilized in formulating specific descriptions. Morphologically the five species show close conformity in all essential features. In their host relations they are equally uniform in that each species utilizes some species of the avian genus Centropus as its definitive host. In the present paper a sixth species of this genus is described in which the same adherence to general morphological pattern is observed, although the definitive hosts are mammals instead of the customary bird hosts.