The first time that this beetle proved itself to be a pest of coffee to any great extent in this country was on native coffee, Coffea robusta, in the Chagwe District, in 1910, at which time I began to investigate it. Since the first outbreak it has been found attacking C. arabica on several estates. Some of the estates have suffered serious damage, especially the older ones which are badly affected by the coffee leaf-disease, Hemeleia vastatrix. With a single exception, I have been able to trace the origin of the outbreak to plots in which leafdisease was already present and in which, consequently, the trees were the least vigorous.