1. This paper reviews the morphology, distribution and hosts of I. schillingsi Neumann, 1901.
2. Two new species, I. rageaui from the Cameroons, and I. lemuris from Madagascar are described and figured. The latter shows obvious African affinities and is but slightly different from its African relative.
3. I. schillingsi is, with the exception of Lophiomys ibeanus (crested rat), known only from Colobus monkeys, I. rageaui from monkeys of the Cercopithecus group and I. lemuris from Lemur rufifrons.
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