Since we published our last notes upon new species, a considerable number of specimens have reached us from various parts of the world, thanks to many gentlemen who have interested themselves in these parasites. We propose to group our descriptions of new species according to genera as we progress with the diagnoses we are preparing for the work on Ticks which we are publishing in conjunction with Messrs Cooper and Robinson. We have already described several new species of Ixodes and Haemaphysalis and in this paper shall confine our descriptions to species belonging to these genera. Although, more recently, we have received many specimens belonging to the genus Ixodes, we have, in the majority of instances, been able to refer them to established species, but sometimes with great difficulty owing to the meagre description given by many authors, and especially to the absence of figures. We consider that too much stress cannot be laid upon the necessity of illustrative figures accompanying authors' descriptions of new species for a glance at a figure frequently suffices as a means of rapidly identifying a species, and for this purpose the simplest text figures are usually amply sufficient.