Note 4 — Genus VI. MADOQUA.

We are indebted to the authorities of the Smithsonian Institution for a series of measurements of the hoofs of the Kilimanjaro Dik-diks collected by Dr. Abbott. These measurements have helped materially to bring us to the conclusion we have come to above, as their wide range of variation shows that certain differences in the hoof-lengths that we had previously noted in the different forms cannot be regarded as of any value for distinguishing the species, and must merely be due to individual variation.