Abstract
1. A new species of tick, I. theileri from South Africa, is described. Hitherto it has been collected only from birds.2. Existing descriptions of I. daveyi Nuttall 1913 and I. brunneus Koch 1844 are amplified, and the synonymy of I. frontalis (Panzer, 1795) discussed.3. Diagnostic characters, whereby I. daveyi, I. brunneus, I. frontalis and I. theileri may be separated, are tabulated.
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